Can you just know that someone likes you?

Sorry so long everyone!

Help a girl out...

I am leaving a relationship, however the person I am attracted to doesn't know it yet. I don't want to rush into anything or hinder the friendship of our kids. We discussed this early in our friendship, that it could be too easy to fall for a friend when you confide in each other. He is a psychologist, and so I don't know if head games are involved.

We have discussed his failed dating attempts and my failed relationship. We don't talk about it much now. He doesn't tell me if he dates. He said that friendship can grow (about his ideal future mate), so he isn't dating for a while.

I am attracted to him, however I don't want to be. We purposely just do the kid exchange to not cross any lines. He put his kids in the same activities as mine, and I always feel he's watching me during my own adult soccer matches. He comes a little early to get the kids and kind of hides in the back, I feel as if he's watching me.

I feel tension every time we talk. I'm nervous every time I talk to him. He stumbles his words when it comes to certain topics (like would you like to take the ice cream outside to eat...one of the few joint activities with the kids.) Last week he flew up in his car to get the kids for soccer practice, with music blaring and a big smile, something he's never done around me. It was strange.

I don't know if I should tell him that I am attracted to him, years ago I told him I looked at him like a brother. Still it's as uncomfortable as the first time we met. I don't want to like him but it seems I like him more every time I see him. I wouldn't cheat on my long time guy, but we are separated and moving on. I'm looking towards five years in the future as a time I could date someone new.

Does any of this give you guys a clue on whats going on here? I'm so confused. All I have done before is distance myself all I can. He has done that too. Maybe this is all in my head.

Advice?