Low sex drive

I have been with my boyfriend for almost two years and my sex drive just isn’t there. We were hot and heavy when we first got together and it slowly swindled down. Being my fault. I am just never in the mood and I don’t know why. When we do have intercourse it’s good but I just have no desire for it. Leaving big dry spells for us. This seems to of happened with my past partners too. Is there something I don’t with me? I don’t wanna be cheated on because someone’s humans desires can’t be met but also don’t know how to make myself feels those desires more. I’ve spoke to my boyfriend to see his point if view and he says it doesn’t bother him but I think it’s to spare my feelings.