So i been dateing my boyfreind?fiance for two years but hes changed so much?

we laughed and talked and he even asked me to merry him and of course i sad yes but his x really screwed him over and hes told me before he thinks im going to do what she did to him but ive told him im not going to at one point in time i was so in Love with him and was thinking that he may even be the one but for the lat 7 months or so its just been bad he says the rudest stuff disses me and gets mad over the dumbest things and cusses at me and says hes done with me but then he calls back and acts like nothing happenedd i love him anddon'tt wanna lose him out of my life and hes said before if we end what we have hes forgetting about me and deleting me from his life phone myspace and everything im so confused i guess what im saying is leaveningin my life but im not really in loveeLove him anymore becausee of the way hes been treating me can somebody give me advice this has been tearing me up for months and months