<human>: Can you condense the text into three sentences or less?

Throwaway. So my girlfriend and I go to the same college and have been dating for about 11 months and I've never been more happy in my life and she the same. I know she was for sure the one before she told me that she got really drunk one night at the bar in our first month and a half of dating (which she hasn't done since then) and texted a friend of mine (sober) wanting to see him and go to his house all while ignoring my texts and calls. She went to his house and took off her "bar" shirt and put on one of his t shirts and laid on his bed for about 20m while he sat there and didn't say anything. They then made out for no more than 5m and then both of them felt awful and she came to my house after and I took care of her because she was so gone, not knowing any of this. 

She has never had any feelings for this guy (her words) but it is hard for me to believe that aspect when she did this and was texting him saying she "hated that she wanted to see him". I know for a fact she is telling me the truth because I confronted him who is no longer my friend and he said the same story. 

What should I do from here? We've known that we loved each other about a month after this incident took place (she was the instigator of the whole love thing) and has shown me nothing but love and given me no reason to doubt since. I am a terrible person at showing mercy and idk where I should go. I know that she is devastated by her actions and feels actual remorse and will do whatever it takes to get my trust back but I cannot stop picturing that incident in my head. Do I need to grow up and know that she obviously learned her lesson and has done everything she can to stay away from this guy and the type of friends she was with. Also I'm her first real committed relationship so maybe she was just having a hard time with commitment to one guy? Help
<bot>: Girlfriend cheated early. Love each other now. Shows genuine remorse and has done whatever she can since then to never have it happen again and remove herself from putting her in any kind of similar situation.