Most Helpful Guy
You need an actual counselor.
Most Helpful Girl
Sweetheart if you aren't happy don't stay. If you feel sparks with someone else it's okay, these things do happen. He'll still be able to see his kid, and I'm sure you two can be civil about it since you share a child. If it's time to move on then move on.
If you are going to stay, however. Tell him he needs to help you more, that with balancing being a mother, being pregnant, being the provider and being his lover-- it leaves no time for you to try to relax, unwind and just feel like you aren't constantly going. A relationship should be 50/50. My boyfriend works, so I do housework, cook and balance the rest of our stuff out on the days he works. On the weekends, we spend Saturday doin whatever work and errands left over together and then Sunday's are all about us and relaxing. See if he'll listen to it
I'm on this sits once or twice a day-- if you need to talk shoot me a message and I'll reply when I see it