I NEED YOUR OPINIONS PLEASE !

So I've been with my bf for over 5 months now , I love him to death. I've been crushing on him since high school and now we're finally together. He's a great bf , he's like my bestfriend tbh , but he has a child on the way. I'm very afraid things might change after the baby is born. He doesn't have a friendship with his baby mother but he's trying to be there for the child but she doesn't want him to be because of her jealousy over me. Although they do meet up and he gives her money every once in awhile but I'm afraid one day they might get back together or the baby might change him when he/she is born. He doesn't speak to me about her that much , I don't even know what she looks like. I really love him and I really see a future with him but I'm very insecure. Do you think I should leave before it gets crazy ? Or should I stay and hope for the best ? Although I did want to be his first but iguess it is what it is.