Relationship doubts ?

I'm having some doubts about my current relationship me and my current boyfriend our on our 19 time dating and this is in just half a year and he's a player so am I but I like him more than anyone else I've dated. I went to a rink on a day and I flirted with this Guy who turns out to be my bfs friend like I knew the Guy flirted with me too. Well anyway my bf found outvand my bf said he was gonna get payback by making out with a girl so I asked him if he wanted to just end our relationship he said no I don't want us to end should I just dump him and move on or if he makes out with another girl do I do the same to another Guy or what I'm confused and this is the longest that me and him have dated