In need of some advice

I'm currently pregnant with baby #2 due in November, however me and the dad decided to separate just before I found out I was pregnant again. At first, he took it very badly, he told me to get rid of it on numerous occasions in not so nice ways either, he was awful to me. He then had an epiphany a few weeks back and we've been fine, working on an amicable relationship for the sake of our children he was being supportive offering to come to appointments with me. We were fine, until a couple of days ago when he told me he'd been seeing someone from his work but it had ended once he told her about the baby. He's now had a full u turn and back to trying to make me have an abortion which is never going to happen, I'm nearly 12 weeks now. But I'm about 99% certain he has some level of depression, he keeps saying his life is over because of the baby, he feels trapped, he hates this baby, his life is ruined. He will not go to a doctor for help, says it's just the baby that's making him so down all the time. We already have one child together, I don't understand how he can be so hateful towards this baby and I don't know what to do? I don't want to stop him from seeing his child but I'm genuinely concerned about his mental stability, he thinks when baby #2 is here, he will see our other child and not even acknowledge this baby. It's breaking my heart, this isn't the man that I fell in love with and wanted to have a family with.