sex talk, please help me!!!!

Hey guys I need your help asap, okay my boyfriend and I get into a lil argument about sex, we haven't had sex for the past one month and two weeks. Is not like I don't want to, but I just don't have the feeling for sex anyone, and I feel bad for him, because what he want I can't give it to him. And I don't want he to go out there and cheat on me. Pls your help me🙏🏾🙏🏾🙏🏾