Should I Listen to my head or my heart???

I keep going back to this guy..each time he has taken me back but we just broke up again..we have issues and he causes so much stress in my life but I can't be happy wihout him...I don't even know how he feels anymore..but I want him back..I was going to casully talkto him at school but I don't know if I should do this again..last time I went through so much pain...should I go wih my feelings or with my logic?