No, I doubt Miroku would ever cheat on Sango if they ever "got together". Sango is the only one for him, and he even admitted that. Boy is your icon going to give me a seizure. Back to what I was saying. Yes Miroku may be a very perverted Monk, but old habits die hard. Also, he loves Sango, and no woman can take that emotion away from him. I don't think he'd ever cheat on her. He loves her too much to hurt her, and I think Sango knows that.