gotta do it I guess

I just feel like my marriage is at the end. Back story he was active duty army I gave up school everything to move to Texas with him moved to Washington state we were married 3 years before I got pregnant with my daughter and during my pregnancy when I was about 6 months I flew home for my baby shower and after my husband dropped me off at the airport he literally picked up another woman that he met on an online chat site at the same airport 10 mins after he dropped me off. She called me to let me know she was at my house I found pictures on our computer of them at our house. I ended up having my daughter in washinting state flew home when she was 6 weeks old. I filed for divorce we were legally divorced and while we were divorced we started hanging out and I thought things were good we went to counseling and everything so I ended up remarrying him and I'm really regretting ever since that he's been so rude to me he snaps at me and my daughter she's 2. He blames his attitude on his PTSD which is not all the case he refuses to take his medications. We constantly fight. I feel so numb I'm not happy I know I need to separate for good. It's hard I have 2 semester of RN school left. I just feel alone and like I have no one and I just need somewhere to vent...