Pregnant but want out !! Advice truly needed.

My boyfriend and I have been together for three years, and living together for over a year. I’m currently 8 months pregnant (32 weeks) and this pregnancy has been rough. Our relationship has definitely taken a turn for the worst and since I’ve been pregnant we’ve been going downhill over everything you can think of (communication issues, finances, petty arguments, etc). We moved to a town together away from my family due to me getting a new nursing job. Now I’m regretting everything from moving here with him to getting pregnant. I cry all the time and I’m always stressed because I feel like I brought this upon myself. Like I should have just stayed close to my family and never had gotten pregnant. I already have a 6 yr old from a previous relationship and I’m technically a single parent to him although my boyfriend helps out. We’ve had so many bad fights since I’ve been pregnant and have said so many bad things I honestly think we are to the point of no return. I’m not happy and I can sense he’s not either. I want out so bad but I feel stuck !! I feel that he’s disrespectful and doesn’t care about my feelings and he feels I nag too much and I’m never really satisfied. All in all, we cant find a happy medium. If we can’t get it together now I’m sure a baby will only make things worse. I feel so stupid like why did I do this to myself !? I want to leave but it’s like where will I go ? Leave my well paying job and break my lease, to move back to where my family is ? He’s the only one here to help me with my oldest son so I feel like I have to sacrifice my feelings because I need the help. I have no family or friends here to babysit etc . I pray about it all the time asking God to get me out of this situation. I just don’t know what else to do. I feel like if I didn’t already have a child who goes to school in this town I could just get up and leave him. Now I’m adding another baby to this mess. I’m so mad at myself. It’s like do I sit here, kill him with kindness and eventually figure out a plan to leave after the baby comes? I don’t have anyone I can talk to this about. If I call my sister or grandma they will panick, drop everything and try to come stay with me but I don’t want them to have to do that although I know they would. But I would also get a ton of “ you should’ve never moved here etc”. I just need someone to vent to and get good advice from . I’m exhausted physically , mentally and emotionally.