Toxic relationships

Lately my bf and I have been arguing very often last night he went to the club with his friends (work friends) he never has done this but he got home at 7am! I was arguing thur text all last night bc he legit lies about texting his co worker she messaged him on Instagram I saw he deleted it but idk what they messaged each other and she was their last night our fights have legit been about her lately I was mad bc if he wouldn’t delete the messages I would be okay! Bc supposedly they were talking about work but why delete the messages? Last night he promised me breakfast and I woke up and said okay let’s go to breakfast he got so mad and saying so much shit to me and then made a commit and said “man stop eating already” I am fat I know I have issues and I’m not attractive at all. So this tore me down bc I know he things I’m like a whale, then we started arguing and he hit the shit outta my face with a pillow, I don’t know what to do I just can’t stop crying I’m so upset with my self being so fucking big and ugly and insecure.