Are past relationships the new relationship problem

Cassandra
So I have been with my bf for almost 2years when we first met he told me he had an ex gf who is saying her child is his, a year later it turned out to be his. He has to pay his ex for the child he doesn't see or want. He is always asking me to help him get rid of the problem with her about paying for the child he wants to sign his rights away but he is always asking me to get involve. To me I don't feel comfortable doing it cause it's not my place and I feel like a new gf shouldn't have to deal with an ex problem. I'm totally confused on what to do.