Pregnant and not happy.

I’m currently 30 weeks pregnant with a man I ended up having a one night stand with .(Please don’t judge, it was foolish of us but we took responsibility and are happy to be parents)

We had feelings for each other before this all happened and so we gave it a try. Things were going great.... But after a few months things started to change. My four year old son, who I have from a previous relationship doesn’t like him. Which makes it more difficult. My bf sleeps all the time, when he works a 7-3pm job and I work rotating 12 hour days/nights and never get a chance to sleep between that and raising a child. And believe me, at 30 weeks I am tired. He is a great guy. He does a lot for me but I just am not happy anymore. I know if I told him this he would be hurt but I just feel something is missing?

I’m not asking what to do, but wondering if any other moms left their SO while pregnant? I’m aware it will be hard raising two kids. I already have my son full time as his dad isn’t around. I have a great paying job so money isn’t the issue. I just feel myself falling back into depression again or maybe it’s just pregnancy related but I don’t know?