Am I the only one? Anyone feel not themselves m? How do you cope with so many emotions?

I feel so over being pregnant.  It's my third son and I never felt this bad. I do get emotional but this pregnancy I feel so unhappy and alone. My current BF cheated on me during the pregnancy when we got into a fight.  Every since then things seem to make me even feel worst. Everytime he leave the house I hate it, I don't trust him, i call him as much as I can , I don't trust any man right now, even my guy friends  I seem to have an attitude with them. I feel like doing something stupid to make him feel bad like he did to me, I feel bitchy, I cry for no reason and I feel so crazy sitting home all the time. Right now im on maternity leave , so I don't have a lot of money right now.  I hate depending on any man that I can't stand at the moment.  Sometimes I even pick arguments with him. I feel sad because I know my other two boys can see the distress I'm going through. My girlfriends get on my nerves right now, I don't feel like answering their calls or talking. I just feel angry, hurt, stupid for moving in with my baby father, lonely, disabled because I can barley do shit , and just confused.  Please don't make comments like "just leave now" , if I had the money and the strength to do anything then  I would , trust me.  Anyone have similar experiences, feel depressed or just crazy?  ughh I'm wondering if it'll get better when the baby is born.