Lost

what i don't understand is why do males say they love you and when your gone they change. Im in a relationship ( I think I am ) and now that we aren't together right now hes talkin like he doesn't know hes confused I mean Whats goin on i put my all into it and im feeling hurt cuz of hes words of i don't know hes saying its not me but isn't that what is said not to hurt feelings Im willing to give everything up to be with him and now im not sure i don't know what to do im feeling hurt and depressed feeling my life is worth nothing how could i get my all and think i was getting the same in return when in time i find i wasn't makes me want to say good bye to everything knowing thats not the answer but what is i don't know im lost