Help?!!! i am being like tormented?

i had a boyfriend for only 5 months and we broke up (he broke up with me) 6 months ago from now! I moved on and went to school at university of arizona and he stayed home in MI. we are far apart i am single and enjoying life. he has a new gf which hurt but im fine. when i come home its full of memories and even tho im not completely over him im forcing myself to now think of him...and even when i am not thinking of him i constantly every night have dreams abut him or his new gf. who i dont even know! its liek i am being tormented i cant stop or control my dreams? i dono what to do its making me miserable and negative and mean and i want it to end.