<human>: Can you give me a shortened version of the text?

To start off, I have been dating this girl for 14 months and our relationship has been great for the most part. She is extremely intelligent and personable, and we get along extremely well. We met at University, and unfortunately she has been at home for the summer so I don't get to see her very often, which (admittedly) has put some strain on our relationship. 

This past Friday, however, I was out at the bars and ran into one of the girls I work with. We ended up talking for a little while, and she went in to kiss me. And I just let it happen. I ended up making out with her for a little while before I freaked out, left the bars, and went home. 

I regretted everything and I immediately told my coworker that I cannot see her outside of work anymore. When I called my girlfriend today she was devastated and told me that nobody has ever hurt her more than this. She kept telling me how stupid I am and how she will never be able to trust me again. And I know she is right. I understand if she doesn't want to speak with me because I completely betrayed her. She ended up hanging up on me when she started to sob. I am absolutely devastated that I hurt her like this but I don't know what I could possibly do to make us alright again. I almost feel like I shouldn't have told her at all.
<bot>: I made out with a coworker and now I think my relationship with my girlfriend is ruined. I realize I'm a scumbag.