[TheLegacy]

1) Get a family lawyer NOW!! and make sure he has custody or at least 50/50 custody so that she can't take off and he has legal recourse.

2) His past is your past now, bear with it - but in time he has to remove himself and get closure from his past relationship in order to give you his full heart. It's your choice now but you may have to deal with his shit for a while, and he has to know that he needs to focus only on his kids and work with the law and system to get them. Support him emotionally and mentally the rest will follow.

Trust me I have been there.