Married Military Member Question...

Not sure if this is the right place for this question..

I have been dating this marine for almost a year now who told me in the beginning he was married but "separated" but getting divorced. Well, I gave him the benefit of the doubt and ended up getting pregnant by him. His wife knows and is also dating someone else but as I said, they're still married and they haven't even finished the paperwork yet.... He's trying to not sign the birth certificate out of understandable fear of the consequences that may come from it. I, however, don't really think it's fair. My question is, if he were to sign the birth certificate, what would happen to him? Do you know of any similar stories, what were the outcomes? I would feel guilty in a sense if I got him in trouble but on the other hand, it's not fair to me because I was being told for almost a year now they are getting divorced and etc. Sorry for the long post and I apologize if this isn't the best place for it. Any feedback is appreciated.