Libido

My poor fiancé. Oh boy. The poor guy loves having sex. Loves anything sex. We were each others first and while I also love having sex with him, I am just never in the mood! What do I do to fix that?? I’ve tried different supplements, tried getting myself on before going to him... anything. And he’s been so respectful and sweet I can’t believe he hasn’t searched for someone else to get it on with (I know he hasn’t because I’m a psycho and find out everything). He’s really great. I want to know if anyone else has had problems with their libido and if you’ve figured out how to help it?