Should I tell my girlfriend I had sex with her sister?

[Anonymous]

Last year before my girlfriend and I were exclusive and were free to see other people, she left town to spend Nee Years in Las Vegas with her friends. I was already a long term friend of her and her family and they were all secretly rooting for the two of us to get together. While she was gone her sister and I were invited to the same party. I didn't pick her up or make plans to spend time with her there but as the evening went on we both drank too much and stayed around each other for most of the night.
I went to leave and she went with me, saying she didn't want to be at the party alone. Instead of taking a cab to her apartment she hopped in my cab and went home with me. We had sex as soon as we got to my apartment, and she stayed the night. It was actually really great sex, too! The next morning we both wake up with hangovers plus she feels rotten for sleeping with me, telling me she knows how much her sister likes me and starts crying. We make a promise to never tell my girlfriend.
But now girlfriend wants to move in with me which is big step in our relationship. Should I finally open up about this? I've actually had nightmares where her sister tells her we hooked up and it really bothers me to this day.

Tell her the truth

Don't tell her it will only hurt her

Updates

+1 y

thanks to all for your input. Most everyone thinks I should tell her what happened. Hopefully I have the strength to do that.

[Asked_answered_byme]

You have to tell her. But don't just say it and leave it like that. Tell her what happened before and after, tell her you didn't mean it and that you are sorry. Tell her how her sister broke down the morning after because she felt so bad. She has to know but don't make it sound like you wanted it. If you truly care about her it will work out. But if you honestly do like her sister more then what's the hurt of her breaking up after you telling her? This sounds harsh bit it's true if you think about it..

[Poppykate]

Should I tell my girlfriend that I had sex with her sister, OR stick my dick in a blender? Hmm they will be just as painful as each other! 🤔

[Rei02]

Tell her the truth, it Will hurt your girlfriend more if she finds it out by others or in another place and you haven't tell her before.

[Enaya]

The truth will always come out. The later it is the more you will lose. You will lose both ways.

[WhoisntBi]

It depends. If you were not exclusive & bit tort her she obviously slept with other people too. The question is has she told you about them? Whether you slept with her sister or not doesn't matter, what matters is if you are telling each other who you slept with before the relationship. If you think she'll understand because it was before then you should tell her as she shouldn't be angered by what you did before you got together

[AustinMan]

I voted B. No good can come from telling her. You need to live with what you did and find another way to atone. The only exception is if you think your fling with her sister has had a material impact on how you feel about your lady. If not, keep it to yourself and swear the sister to secrecy, forever. If she were to spill the beans at some later time, the results would be devastating.

[bedroomeyes]

If you don't tell her, her sister will during a heated argument.

Make your decision, because you're fucked either way for doing something so stupid in the first place.

[BuchitaBuchys]

The truth always comes out. And I'd definitely leave a man who's slept with my sister or bffs. Even if we weren't dating.

[ReneDS]

no don't , you make will create massive chaos, and what if she had slept with her own sister as well?

[tyber1]

Yeah you need to have that conversation, the longer you wait the worse it will be if she does find out and you don't want a secret like that hanging over your head.

[Anonymous]

Just tell her if it's bothering you that much but you probably want to let her sister know before you do. What's going to happen is she is going think you kept this from her for all this time, and is there a possibility both of you will do it again. If it was me I would just keep my mouth shut not hurting anyone you didn't cheat on her. I have dated 2 sisters before one then the other a year later had sex with both of them, but they knew about it.

[Anonymous]

There's nothing to say, she doesn't need to know.
You guys were not exclusive, it was just a mistake, you didn't cheat. It will create a lot of tension between you three.

[KBob93]

There's another person involved in this. You could be ruining her sister's life and relationship with your girlfriend if you were to tell her. Don't throw her under the bus!

[MusicMayhem]

You wrote this sounding like you're trying to justify what you did. You both fucked up and she deserves to know the truth. End of story.

[Mesonfielde]

I wouldn't tell her. It seems like a bad idea, what exactly do you hope to gain beyond easing YOUR conscience?

[HentaiMaster23]

You shouldn't of slept with her fucking sister you're a horrible boyfriend

[Unicrone]

Tell her cuz if she finds out later she will never trust you again. Just tell her you were both really drunk and didn't know what was going on. Also mention how bad you both felt right after

[squeelz]

She has the right to know she should know but honestly I don't think she would stay with you after hearing it

[Anonymous]

Nooooooooooo

If she asks you then obviously don't lie to her, but if she doesn't ask then there's no need to tell her. Some things really should not be said.

[frederikwinter]

Don't tell her the truth, you also would ruin her sister.

[skeptic007]

no if you don't plan on doing it again than say nothing but if you keep sleeping with her sister than break up

[Anonymous]

don't you think the sister would of told her by now.

[giveherthis]

Dont fuck do it DONT FUCKING DO IT.

[giveherthis]

Dont do it do you really love her? Then dont do it. You're basically risking your relationship between you both. Some people might say tell her because it might make your relationship honest but thats total bull shit. Some people aren't kind enough to forgive you. And you should be ashamed of yourself for sleeping with her sister thats really messed up man. If you really love her and want to be with her forever then dont tell her.

[Words_and_Wisdom]

If she loves you, she'll forgive you.

[brandog0]

lol your screwed either way

[DooKan]

she probably had a great time in Vegas with men