cheated, now cheated again.

My boyfriend and i have been living together for a year in August. In February, i saw he had been texting other girls in a way that wasn't okay, at all. He agreed and i told him if he ever did it again then i couldn't be with him anymore. He drank ALOT last night. His mom was in town and she stressed him out, hes a stress drinker. He doesn't know that i know about the second time. I was setting an alarm on his phone because he had been drinking and he always gives me the clear to do so. His snapchat was open to a girl who he dated for 2 years telling her he was still in love with her and i was nothing to him. Then proceeded to ask two different girls for innapropriate pictures and for sure sent them back by asking " did you like my dick pic i sent" . I put his phone back down and laid down this morning. Ive had no sleep and just want to think im being irrational. Bringing stuff up while he is drunk is setting fire to anything basically. My mom is telling me that i should pack my stuff while he is at work today and move back home. I agree with her in my mind but the way he kissed me goodbye this morning is going to make me miss him like you wouldn't believe. I know i need to get out of here but i don't think i have the courage to leave today.... advice?