So I'm very positive that I'm on the verge of a break up.... Me and my boyfriend got into an…

So I'm very positive that I'm on the verge of a break up.... Me and my boyfriend got into an argument an spent 4 days in seperate rooms.... So we talked and we been doing good till today when I go to use his phone(was being lazy and didn't wanna get up to get mine from the livingroom) I get on the internet an I see that he has been on tinder... Like who the fuck does that? Ugh I'm at the point were maybe me being single is best right now