How can i mend my relationship with my boyfriend? (short description)?

Well, if he changed for the better, take him out to dinner and reminisce on the good things you guys had and try to take him somewhere you know he likes. But if he changed for the bad, I wouldn't stay....relationships that started sketchy and is still going on even when you guys get back together is pretty unhealthy for you and the other party. So hope it all works out!