The thing is it will be hard to have a relationship with him now because he does have kids. he's always going to love this other girl and never fully leave her,it basically impossible. he still talks to you and stays close because he doesn't know who he wants. it's easy for him to go back with her because hes been through so much and they have a future together with the children now. what i suggest is that u just cut lose of him and let him be with his family, i know it will be hard at first but its the best thing for you in the long run. you'll get over him and before you know it you'll have your own family to worry about. you have to let him know he cant keep running from you to her and then back again ur heart cant take it. he just wants whats best for him or maybe his children and if its her then just move on. anyway stay strong hun if u need me u know where to find me