My guy gets pissed off so easily now. i dont know why and what is happening to him.. what can be the reason fo?

he is trying to control you....trust my hunny he might CARE for you but he does not LOVE you....and honestly i think he really is in love with his ex because a man wont say things like that if he doesn't really mean it....i was in a similar situation with my husband when we first got together but then i got fed up and showed him that i will not be controlled and that if he wanted to be in control that he needed to find someone else....you need to stand up to him and let him know that you will not tolerate this type of behavior any more and trust me either he will leave or he will straighten up and if he leaves then you know he doesn't love you. good luck