What should i do

I've Ben with my so for alil while and he used to tell me me he loved me a lot and I loved it to hear it cause it made me feel good or when he would tell me he missed me when he got home from dropping me off at my place it feels like tht maybe he's losing his feelings for me any more he'll say things that will make me feel bad and the only times he's nice or sweet is when he's in the mood for sex.....I just dnt knw what to do right now and I'd like so advice on what I should do