my guyfriend, who i like alot, will never admit to being jealous until he blows up.

for example, one day, if i see my guyfriend while hanging out with him and talk to him for a few seconds, at the end of the day he flipped and told me to leave him alone.  then he called me and he finnally told me he liked me and he was jealous.

next day he pretends it never happend, still saying jealous stuff though. but he says hes not jealous.

then the next day something happends and he flips on me again and admits hes a jealous freak and that he likes me alot and wants me to stop talking to other men.

next day he pretends it never happends again. ill ask him, and he tells me he really doesnt care anything.

then flips again soon later

please help me out. why can i only get him to admit it when hes totally frustrated?