I've screwed up bad, need advice

[Why???]

I cannot believe I am posting on one of these things but I'm at a loss and don't want to lose the love of my life. Where do I begin? I guess the tip of the iceberg. On a vacation recently my fiancée and I decided to head out to a show and after I decided I wanted to drink no matter what while she preferred to go to bed. Instead of doing the right thing and going with her I caused a scene and left her there and did so anyway. I went so far on the night out a found a bunch of people to hang with including a
girl who persistently made advances on me. Instead of leaving I just kept rejecting her informing her I was engaged. As the night wears on I invite the group to my hotel bar to hang out so I could get a ride back with no luck. In the worst staten of my life I show up drunk toy fiancée and pass out when the phone rings the same girl speaks To my fiancée invites herself up and into our room smiling. I am so angry thinking about it but I caused the situtation and of course she thinks I cheated. I don't blame her I don't know why this girl tried to ruin my relationship but in the end I chose drinking over her and I regret it so much.

I've been on a downward spiral for months in the way I've been treating her and it's only now I see myself for how I have been. I've been stressed out with work and had some family issues but I never would use excuses I'm just a real asshole. I honestly don't want to lose her and would marry her today but I may have ****ed everything so bad. This is how far I'm willing to go for any advice and explanation for what I did

[Di741111]

Dude, you really screwed up. I'm a girl, so I'm gonna think for your fiancee. if i were her, I'd be really really really mad for months, cause she wouldn't believe that you didn't cheat on her. But hey, shes your fiancee, she loves you no less than you love her. You should have a serious conversation with her, talk everything through, lay the facts out. And maybe get the girl (who tried to ruin your relationship) to tell your fiancee the truth.
Be honest with her and tell her what you really think, you love her more than anything, she knows it, just give it a little push. Communication is the most important thing in a relationship, just need to be honest.
Everybody makes mistakes, just believe that your love can overcome everything!