Kee,
Our Situations sound extremely similar. My H also always says to me that he will always love me, even though he has left me and come back 3 times in the past 4 years. He is out drinking his life away currently.
I got a text last night at 2 am from him saying "I really hope we can be friends in time"- (he just left me again a week ago). I think its his guilt.
I am exhausted, I am growing weary just like you. We also have no kids. But I hate taking this MLC ride.
At first, I put ALL my efforts into DBing and it seemed to work, only to have him leave again and again, I just dont know how much more I can take.
I think it is a good choice of yours to go be with your family, I dont know what I would do right now with out the comfort of mine. Hopefully, it will help you feel relieved and loved and give you some space from your H. Good Luck!
TIPPER