11 yr old son jealous when mom dates?

his father & i split up when he was 2 & since then he hates me dating i remember when he was a toddler and my BF & i took him places he would kick the back of my seat if he saw us holding hands. that BF & i split after 9 years & i started to date again i got into a relationship & was in it for 1 yr & he hated that BF of mine as well he would get mad slam doors and get violent when he saw us hug or peck eachother on the cheeks i was afraid to spend time with my BF bcuz i was scared about my son getting angry well me and that BF split up he was 9 @ the time so now ive been with my current BF for over 8 mnths & just last nite when my 11 yr old was suppose to be sleeping i was up in the living room talking to my BF & we heard the doors slamming over and over so we checked it out it was my son he was getting violent locking us out crying & we had no clue why bcause he had just bought him a new bike that day & we went riding together so the outburst was out of nowhere i dont understand hlp