By talking to him you have opened Pandoras Box, you are once again on a slippery slope.
Hon, he is not friendship material, there are many fine people out there who can be your friends.
You are allowing him to occupy too much of your brain space, he is who he is, you cannot make him feel regret, you cannot make him a good father, you cannot make him a good husband, you cannot make him anything he is not.
Might be time to give up on the "Lets Be Friends" idea, all it does is upset you and that will never change, however, the good news is that you can change, you can take your power back, life can get better...if you will just let go of him.