Boyfriend troubles

My boyfriend and I are pregnant. He’s not excited about the pregnancy. This is his fifth kid my first. 3 from a previous marriage, 1 from another relationship. He basically told me that this is going to ruin his life and it’s the worst thing that’s ever happened to him. He repeatedly blames me, because we broke up back in December, but then decided to stick it out around may. (However, during this time we will lived together) he refuses to tell his other kids who live with us and says he’s scared and afraid of what will happen. He said he had no intention of having a third baby mama and had made it up in his mind, he didn’t want any more kids. But, he never told me this.

What do I do?