I Can't Figure Out How I Feel

Well, there's this guy, who's like one of my best friends, and I used to like him for about 3 years, and nothing ever happened, we just became really good friends. Well one of my girl best friends went out with him this year, and they broke up because he liked someone else while he was dating her, one of my other friends. Well this summer, he calls me on the phone at least 4 times a week, and we talk a lot. When my friend went out with him, I thought I was completely over him and moved on, I liked someone else, I thought. But I can't seem to get him off of my mind, I'm always thinking about him if I read like a dating thing, subconsciously I was thinking about him. And I don't know if I like him...but now my best friend is thinking about going back out with him, and I can't really talk to her about this, because I feel like I betrayed her liking him when she was going out with him, and... I thought I didn't like him anymore... I don't know what to do... I don't know if I like him or not.. but this past summer we've talked a ton and I can't get him off of my mind, and I feel sort of jealous when he talks to me about other girls.... I don't know what to do.... And when he gets on MSN I sit there hoping he'll talk to me, and I don't talk to him, I feel stupid if I start the conversation... anyone have any advice or anything?

(and please do not bring my age into this, I hate it when people do that, age doesn't matter, talk to me like you would talk to anyone...)
Thanks....

Talk to him about it. Maybe you two will hit it off.

He knows that I used to like him, and I don't really know if I like him or anything, and I don't want to talk to him about it, he'll think I'm joking and I think it will be awkward... I don't want to ruin our friendship or make it weird or anything, and he JUST started IMing me and I feel so happy, glad to talk to him, but it feels weird too...

he said brb for a second, and I can't stop clicking on the convo. and seeing if he replied, and its like a big disappointment if he didn't