if you want to have him then you may have to let him to do back and forth or he may get another new one for fun who knows. but the thing is people can change for their own good. he may change for you who knows. or maybe the way we are thinking of him, he may not that sort of person. we cannot tell. one and only you know him well (not even his ex or not ex-wife) so you better know how to deal with him rather than anyone. 