My boyfriend tends to be angry for no reseaons!?

My boyfriend loves to argue for dumb reasons then denies hes angry when its obvious an blames it all on me. Bipolar? He always wants to argue over stupid things. He always tells me its my fault an when i want to talk about it he tells me he doesnt want to we can talk about it later. Makin me wait until its on his time! He sometimes says little things to make me think that he thinks im cheating but its only to start another arguement!! WEIRD sometimes he even goes so far as to say dont call me anymore then if you dont wanna hear what I have to say. this really bothers me simply because ive known him for 3yrs an we've been dating for 2.After all arguments towards the end of the conversation he professes his love for me an how much he adores me an how bad he wants to be with me this type of behavior isnt normal. I tell him ALL the time I think somethings seriously wrong with him so he took a test an now he believes hes bipolar.. Please help me figure out what to do marriage is possible?!?