Can yall explain?

Ok so like sure yeah rory & dean were both bad for sleeping together while he was married but like... wtactualf was his problem here? Like awww oh noo your college going girlfriend has to schedule time to see you. Or was it the tiarra??? Like that obviously wasnt her & he knew that? Like seriously dean? You broke up your whole ass mairrage just to end the thing with rory over a little "i dont belong here do I" LIKE OH MY GODDDDD