Was it my fault?

Why do you want do move on? Is it because things at home are getting too hard for you? If so suck it up. You not only broke your fiancés trust, you get kick out twice. Your lucky she took you back once. And its perfectly normal for a couple to fight.

And if she ever takes to you back don't go to your exes place!

Why are you fighting about the lack of trust? You have no reasonable expectation for her to be over it already. What has it been? 2 weeks? When I betrayed my husband's trust it took almost a YEAR for him to start to trust me again. So don't expect it to happen anytime soon. Yes she needs to be able to trust you again eventually but that only comes with time. So either you need to just accept that and quit pushing the issue, or move on.

I still want to know why you got in this situation at all if you supposedly love her. Seems to me like you were trying to make her mad all along.

I agree that it was your fault. Not so much that your ex jumped you, but that you were over there in the first place. If you hadn't been there, she couldn't have done that. And if you enjoyed the kiss then maybe there is something still there with the ex and you shouldn't hurt your fiance by not being fair to everyone. You can't marry her if you have feelings for someone else.

I think enjoying the kiss (at least to some extent) is natural. I mean obviously you liked this girl at some point or she wouldn't be an ex. To be an ex you had to date her first, lol. But I definitely agree with the consensus here. Why were you drinking with your ex?! That's just a stupid move in my opinion. Seems like there is more to this story, even if you don't realize it. Like maybe you were hoping something would happen with the ex. Or maybe you were just hoping to upset your girl and get her to call things off. Maybe you aren't really ready to be getting married and rather than deal with it, you took the cowards way out. I dunno, only you can answer those questions. But you really gotta ask yourself why you would have even done this in the first place? I am definitely glad you were smart enough not to drink and drive, but another question. Was there really NOBODY else you could call to come get you? You call your current girl to the home of your ex, where you're drunk, and you don't think some stuff was gonna go down? It's like you WANTED her to come and see where you were, see how drunk you were, and get mad at you!

As for fixing the broken trust, that can only be done with time. Even if you convince her to let you back in the house and all of that, don't expect her to get over this anytime soon. And before you even try I think you need to figure out why you allowed yourself to get in this situation in the first place.

There's one thing I don't get. Why can you call your girl for a ride home but you can't stopped some ex-girlfriend from making out with you?

And to answer your update. Yes you are a jerk for enjoying the kiss. And you also sound like care more about your ex then your fiancé, is that true? If not go get her!

What goes around comes around!

I'm pound of one thing and that you didn't drink and drive!

I agree with when- the-rain-fall. Even though you may think wasn't your fault it is but it is (not trying be to rude) think about it why were you at your exes house drinking? Maybe you should try thinking ahead?

Drunk or not, you should know enough to say "Stop." and push your ex off of you. I've been pretty drunk in the past and I have always been able to say the words "no." and get up and walk away.

This isn't really a question of who is at fault, but how it looks. if I were your fiance, I would've called off the wedding. it would always be a question in my mind, what was really going on. and I just couldn't be with someone I didn't fully trust.

Yes, it was your fault. You shouldn't have been getting drunk with your ex. I think I would have done the same thing if I saw my boyfriend make out with his ex-girlfriend. Some girls have mind sets of "I have put up with too much crap from guys", even if you weren't the one who cheated on her. . which isn't completely fair.

Dude, regaining her trust isn't going to be instant. Not a chance in hell of it being instance. You're going to have treat her like gold for a loooooong, looooong time. and since she is your fiance, you should be treating her like gold regardless of this situation anyway.

It was just a bad situation altogether man. Shouldn't be getting drunk with an ex, unless maybe your girlfriend is there. Should've stopped the kiss. Should do all you can to get her back and fix this, ASAP, cause it's completely your fault.