How do I get over my boyfriend's betrayal?

I am totally in love with my boyfriend, we've been together for almost a whole year. At the beginning,i looked in his phone. he went to a gig and messaged a girl he doesn't know "Hi y lady how r u? U out tonight?" then not long after this, we were at a barbeque, he texted his boy mate sat next to him, i'd love to sleep with that girl, who was also at the barbeque. he blamed both times on being drunk and "showing off" it hurts so bad and i don't want to end it os he didn't actually cheat.... please HELP x