I have not ever cheated on him, but yet he swears that I do cheat.

Please tell us more. Does he claim to have evidence? Is he cheating on you? (Often the one shouting the loudest, accusing a s/o of cheating, is doing it himself.) How long has he been accusing you?

Have you asked him why he thinks that you cheat?

I have not ever cheated on him, but yet he swears that I do cheat.

Why does he have reason to believe that you are cheating?

Give us more to your story please.

We can't really answer your question with out knowing more to what is going on.

Do you hang out with other men? Do you come home late? What?

Without more information such as how long you have been married, how often this happens, and what seems to trigger his accusations, there isn't much advice I can give.

What is his definition of cheating? What is yours?

Has he given you any reasons for his beliefs? Has anyone been telling him things to fuel these thoughts? Is he an insecure person who thinks that saying hello to a person of the opposite sex is cheating? Has he cheated and is deflecting the blame?

Are you positive that you haven't done anything that might be misconstrued or that might have crossed a line?