I'd be suspicious maybe but running away only makes misunderstandings worse. Just hear them out before you assume things and have a little faith in your partner. Not everybody is a cheating bastard.
Mmm its not im assuming that he's cheating its more of i know my own brain and my own mentality to know that it will do me more harm to stay than it is to run away. I personally grew up where I would use my imagination to cope with my surroundings and at some point it just got out of hand. So now I over think things and have a hard time differentiating reality from my imagination. So it'll be hard for me personally to tell the difference, and I feel like my lover would understand that and come to me and explain it.
Though this is specific to me and doesn't apply to our boy.
Whack id do the same thing bro, like shit man if someone I loved with every fiber of my being said they went to the club and then you hear a girl say that like wow now. I'd especially feel self conscious about it if he did originally only like women, like whack. Anyways I'm trying to say I would also run away solely cause I'd rather run and calm down than stay and say something I truly don't mean. Ya feel me (〜￣△￣)〜