That doesn't sound too nice, sorry you've been through this. This is actually happening to me. Kind of want him in my life as a friend but more so want to just move on and accept we're over. I'm not really lonely as I'm surrounded by lots of friends and family but it's a little bit isolating when the person you felt closest too is suddenly gone. I decided not to remain friends for now because I don't think it's healthy for either of us. I personally think that if someone can't give you their all they should not be given the liberty of having one foot in your life and yet the absolute freedom to do whatever they want outside of it while knowing it's hurting you.

I have a friend who is remaining extremely close to her ex and they seem to be going great being best friends. I wonder how they do it, but it must be possible.