What are the best set help books to read to get over a long term relationship ?
My ex of 16 years had an affair then started seeing her and then I foolishly took him back and now he’s said he actually doesn’t want to be with me and was just “trying” for “us” so I’ve had 4 months of his half hearted attempt at trying to get back together, constant hot and cold, telling me he is in love with me etc and now this. He thinks it best we don’t see each other except for the kids drop offs, why do I want to keep him in my life? It’s like I can’t let go that he’s no longer my person 
I think he’s back in touch with her and I really wish I could hate him but I just miss him so much and still just want to be around him and really cannot imagine my life without him in it!! We had kids so sadly I can’t go NC.
Any good books for getting over it please?