I don't know how long it's been since you broke up but I don't think you're over him and you're under no obligations to be his friend. He shouldn't be pushing a friendship on you, he wouldn't be doing it if you were a platonic friend who watches football games with him at sports bars.

I don't know why people do this. I recently went through 4 months of emotional hell from my wife deciding she only loves me as a friend now and telling me she's seeing a shrink because she's going through a depression. She finally got the separation she wanted 5 days ago and you know what she's done with that freedom so far? She's called me every day since, sent text messages as well.

I have kids with this woman so I need to keep a civil face until we decide whether there'll be a divorce and I would buy her half of the house.

You're under no such obligation. I think they try to use us a a crutch / safety net while they live out their "freedom" that turns out to be scarier than they originally thought. Live your own life, let him live his.