<human>: Can you provide a brief overview of the text?

Hello! I was thinking of posting in r/dating, but thought this might be more appropriate. 

I've known this guy for about 4 years at this point and we used to work together. I had a small crush on him, but never went through with anything. About 3 years ago, he started dating this girl, and I completely stopped any feelings I had towards him. I had not met her until earlier this year. In about April of this year (up until September), I would hang out with the two of them and a bunch of other friends (sometimes at bars, sometimes at their place). We hung out multiple times a week. 

I have become friends with her, and I really do like her. I was very happy for the two of them. About a month ago, she told me (in person, after bringing him up - he wasn't there, still with a group of friends) that they had broken up. I felt really bad for her and told her if she needed anything, to let me know.

At the same time, I reached out to my friend to see how he was doing. I didn't mean anything by this, except trying to be a good friend. We have been talking ever since. My friends seem to think that he likes me, and I think I like him, but I am afraid of upsetting his ex girlfriend. 

I was friends with him way before her, but I feel like I am somehow betraying her.
<bot>: Friends with a couple, they break up, and I have a crush on the guy. Don't want to upset the girl.