<human>: Hello! 

Recently (August), I was asked out by 20M. I started developing a crush on him around June but he unfortunately had a girlfriend (a girl who hangs out with the same group of friends I do), so nothing came of it. Then out of the blue, she breaks up with him. I try not to be too overjoyed but of course, I am. I still feel guilty about this. I made no moves until he approached me at the beginning of August. I admitted my feelings to him and he also admitted he had started developing feelings for me too after the break up.

So, a few weeks later (end of August) he asks me to be his girlfriend and I say yes! Right now we're really happy. We're both in university and live about an hour away from each other but he comes to visit a lot and I love it. I'm having a great time. The only issue is I still feel bad about his ex. I was becoming relatively good friends with her and she approached me after 20M and I got together, telling me she was devastated because she'd realised she still loved him. I was hurting, I knew there was a possibility he could go back to her, but he didn't. She told him too but he just said it's too damn late.

All of my friends are also commenting on the fact that I'm probably just a rebound. After being with his ex for four and a half years, it is a little weird that just a month later he admits feelings towards me, but that doesn't have to mean I'm a rebound does it?

I'm pretty confused because a part of me believes he'll only be with me if he really wants to be with me. There's a chance he just found me and preferred me over her. There's also a chance though that he needs someone to help him recover from a breakup, and that's just me. I'll only be here for a few months, perhaps.

Provide a brief overview of the text.
<bot>: Got together with a guy who's my friend's ex and was with her for four years. People say I'm just a rebound.