Advice Please!!!

So there's this guy I grew up with (guy1). He's sweet and funny and his sister told me that he's in love with me. He's told me before that he likes me. I am very confused about my feelings for him though. There's another guy (guy2) who has a girlfriend that I might like. But I won't do anything about it, because I'm not that type of chick to steal another chicks boo. But before all this, there was a guy (guy3) that I dated for almost a year then we broke up 8 months ago. My relationship with guy3 messed up my relationship with guy1. When I'm with guy1 I feel like I really like him but when I'm with guy2 I feel the same way. Is it possible that I only like the chase, or that I'm still not over guye, even though I don't love him anymore?