Talk to me!

So my guy best friend told me the other day that he really likes me, even though he just broke up with his girlfriend. We were kinda a thing over the summer, but when school started, he started dating this girl. I got over it and had no feelings for him except friend-love, and now he likes me?! I said I just want to be friends and he hasn't talked to me since and he's mad at me! It's pissing me off because I miss my bff and I don't know what to do.