smother his ass or just leave the messages open

I just went through my boyfriend phone while he is sleeping cause I had a dream last night he was cheating. Has a female sending him thirst traps on Snapchat , girls in his fb messages and regular phone messages. Although besides his mom and grandma I'm the only one in his call log I'm still pissed because he his entertaining these females and not correcting there behavior by letting them know he is in a relationship. I have no problem with him having female friends but when they think they have a chance with him is when the problem come in.