Confused and stressed

If my Fiance does something that should make me really angry, or if I get upset with him he starts rambling off a list of everything that is wrong with me, and tries to start a big fight with me. Tonight he told me he was going to a friend's house to watch a ufc fight and at 2:30 a.m. he finally calls me ( I was at home freaking out the whole time) to tell me he is at a strip club and he needs a ride. I went and got him and he started being mean. I didn't even say anything to him. He said that he was tied of me treating him this way and he was going off because he wants me to get a different job. I'm 18 weeks pregnant and a full time college student, I can't just up and get any job as my college schedule is really hectic, I take six classes. Plus I have a five year old. I just have been so stressed and I don't know why he just randomly acts crazy like this. Just yesterday he told me how much he loved me and how he couldn't wait for the wedding. I'm just so confused.