breaking up at 7 months

So the past few months on and off I have seriously wanted to be out of my relationship. I think I'm in the wrong for staying because the only reason I'm still here is bc I can't imagine my son not being able to see his father everyday and I'm not financially stable to be on my own right now....I'm 7 months prego and haven't worked the whole time so thats my fault. my plan is 6 weeks after baby girl go back to work save up and leave. the issue is living together and finances until then. hopefully it works out. My fear being a single mom of 2 is outweigh by my unhappiness. I'm such a better mom when I'm doing it on my own.. that's sad to say. I hope the kids benefit and not suffer at all from this.