Why am I cheating?

I recently been having anxiety about my cheating on my boyfriend. Of course, I have NOT cheated nor do I plan to cheat on him. Nor do I but myself in predicaments that would disrespect my significant other. However, I have been having dreams over the last couple of weeks of me cheating on him and they have been ripping me apart. I have a great partner and do not want to do anything to hurt him or jeopardize our relationship. Has this happened to anyone else? What should I do? Is it there an underlying issue that I haven’t addressed?

No I don’t have a habit of cheating on priors partners. In fact, I have never cheated on any of my partners and I don’t intend to do so in this relationship either.