<human>: So i was visiting a friend who lives pretty far from me, and we decide to go out together and have some fun, maybe meet a few girls, etc. 

At the bar we start talking to two girls our age, let's call them Lisa and Mary. Lisa and I really hit it off, and after a few drinks our conversation got more personal. That's when we start talking about relationships, and she mentions she has a boyfriend. Now, maybe if I had some common sense I would've realised that it was probably a bad idea for me to keep flirting with her, but I was drunk and an idiot, so we kept going. 
Not long after, she wants to get some fresh air outside, I go with her, and we kiss almost immediately. After that we told Mary and my friend we were going for a walk and pretty much kept kissing the entire night.

We eventually make it back to the bar and we kiss each other a final goodbye (I had to leave in the morning).

The next morning I realised what an asshat I had been. I always thought that I was the nice guy, and not the douchebag who destroys happy relationships. I actually despise people like that.

All my friends tell me I shouldn't feel bad, and that I wasn't the one who cheated, but I still feel like a dick. Any advice?

Provide a brief overview of the text.
<bot>: A girl cheated on her bf with me, not sure whether I'm overreacting or it's normal to feel this way.