I feel like such a whore

My husband and I have been in a rut. I started sexting and having a full blown online relationship. I don’t know what’s gotten over me but I try to justify it because I think my husband cheated on me. And I don’t know what to do. He suspects I am but I’ve turned into a whore I often touch myself and listen to him talk dirty and tell me what to do. And what he is going to do.

Not sure what to do