What do I do? Boyfriend kissed girl says it's nothing

So my boyfriend is on a cruise and he met this chick and they got photos togther and in the photos they kissed each other's cheek with hands around one another and this was all because they had matching belts and I was a bit upset and he got really mad at me for being like that but my friends agreed it was dog - then he texts me after I mentioned what one of my friends said and was like "love this cruise, getting drunk, playing pool with *girls name* all night and showing off our belts" I commented on this and once again he swore at me and basically told me to piss off and turned his phone off

Also he has never posted anything with me on social media

I am unsure how to approach his and am I overreacting ?