I have unethical proof she's cheating. Do I bring it up?

[TypicalMillennial]

My girlfriend of 4 months is cheating on me. I had my suspicions when she started giving vague excuses for things and just jumped me whenever I'd ask penetrating questions to distract from the conversation, but I recently got legitimate proof. I just don't like the way I got it.

In passing one day about a month ago she mentioned carelessly that "all my passwords are just my sister" and so one evening while she was out with friends I broke down with bad judgment and logged into her computer after two tries (she has two sisters) where her imessages are connected to her laptop. There were no explicit texts about having sex, but mostly reminiscing (with her ex) and "Do you miss this" picture sharing.

How do I bring this up? I violated her trust by going on her computer, but she violated mine with these messages.

Should I even worry about what she'll think and bring it up anyway?

[OlderAndWiser]

Why do you need to "bring it up" at all? Just end the relationship. You don't even need to give her a reason. NOTHING positive will come from having a confrontation with her. . . unless you want to give her an excuse to explain so you can forgive her. Is that the deal?

[TroyDT]

Another reason why unmarried should never live together. There is no need to bring it up. Just find new digs and move out. If she asks, just say "You already know why." and leave it at that irrespective of how much she pries.

[Seriouslyitsnotjayy]

Please dump her

don’t give her another reason to lie to you

[Matthew80]

Is there any proof of cheating for sure?
And I would not allow her to know u violated her trust

[TypicalMillennial]

Sending each other naked pictures and asking if they "missed this" is proof enough for me.

[Matthew80]

She is gonna be mad if u tell her how u know I would just use the cold shoulder and find someone else

[Vegasrunner]

Honestly you may want to say nothing because it sounds like you have so little respect for yourself you may never find another girl anyway.

[KrakenAttackin]

Just dump her ass and let her wonder how you found out.

[Hydrogen]

Dumpppp