we don't have sex.

My boyfriend and I have not had sex since our anniversary in September... I literally beg all the time and there's always an excuse "I'm exhausted", "I'm too stressed", "having sex stresses me out even more". It's to the point I literally throw myself at him and I get constantly rejected then I upset myself because I take it very personal... any suggestions?? 😔 I'm pretty desperate. We have no sex life at all and I'm not really sure why. And the add.. the last time we had sex... was the first time in over 4 months... and he was drunk... 😔