Why can't I stop thinking bout my ex?

Hi so I'm a 24(F) and I've been in a relationship for 2 years now. We've been having some issues lately, mostly him just being immature and not wanting to take initiative and responsibility.. I recently messaged an old friend from highschool (who is also an ex) to apologize to him because we had a small falling out years ago. We were always close after the breakup, he was the first person to talk to me when I transferred to our school. He accepted and added me on FB, he's expecting a kid with his girlfriend of 8 months. This is where it gets weird, I never healed from our breakup years ago, I still have feelings for him and when he added me it all came rushing back. He's so genuine and funny, so handsome and just perfect to me. I told him how I felt about him the other night because I felt like it was fair for him to know since he was in a relationship and we were close. He said he really appreciated me telling him and he just kept saying how crazy it is I just said thank you. He said he would try to talk to me more. But the thing is he hasn't talked to me at all, he won't even look at my last message.. He just makes me happy by thinking of him. He makes my face light up. I just wanna know if I'm being stupid or is there something there? He's always liking and heart reacting to my pics and statuses... I just can't stop thinking about him and a future with him... And it's driving me insane.

Why can't I stop thinking bout my ex?
Post Opinion