Hate You

So basically there this guy.. He recently got over a girl he's liked for a long time. We started talking a lot after he got over her. I was falling for him quickly. That's when I found out that the girl that he used to like, is similar to me.. Athletic, smart, even our writing is the same. I thought that we could actually be great friends..
He stopped talking to me today.. One of my best friends told me that he's starting to talk to the girl again. Was I just a rebound for him...? Just because I reminded him of her? I don't like being used..