Thinking about moving!!

Debra
July will make 5 years my boyfriend and I have been together. Most of our relationship has been long distance. He has been there for my son since he turned 3(2012). Two years ago in August(2015), when I told him I was pregnant he said he would be there and everything would be ok and not to worry. In October I got a call from a girl and she said she had been with him since October 2014 and accused me of not being pregnant and he deserves the best and she is the best. I about died!! He was so embarrassed that he didn't talk to me or try to talk to me til 3 months after our son was born. He was born in February 2016 and he finally talked to me in May 2016. I moved to his home state. I have no family and no friends and the only people I knew were ones he introduced me to. From what everyone tells me I think his aunt made him feel guilty and that's the only reason he talked to me after me having the baby. Fast forward to now. The baby was playing with one of his old phones and a messenger sound went off. I looked at my phone and it wasn't mine so then I heard it again. I looked at the phone the baby had and that girls name was who was messaging him. I opened it being curious (I know I shouldn't have!) and seen that she has been trying to break us up by saying she is still madly in love with him and sending him nudes and he never responds but there was one night when I got home from work and he wasn't home and his sister was there and he told me he went to the casino but there was a message in there stating otherwise!! There is so much more that has happened since then. I got fed up and sent her fiancé, who she has 3 kids with, a message saying that I believe something was going on and I have the screenshots somewhere safe if he wants them. He messaged me a month and half later asking for them if I had them and I had them sent to him. Now my mom is coming at end of the month  and I just want to go home with her!! I'm currently 15 weeks pregnant and I just can't take it anymore.