How do you catch him cheating after he knows I know?

Answer 1

Get a small camera and follow him and see where he goes. If you can't follow him get someone to do it for you with a camera in hand so that person can take pictures that would hold up in a court of law should you wish to go there with the pictures of him with another woman especially if they were in a comprising situation.

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better answer

dont listen to the girl up top she will get you in trouble for stalking.find out who the girl is but put a tape recorder under the bed where you think he has been having sex when you go out (if she has been going to your house). then you take the tape and go to her house confront her and ask her if she has been sleeping with your husband tell her that you wont be mad you will quietly go if you know the truth get. it on tape when she is telling you yes we have been sleeping together. then confront him then leave with nothing but an empty house and regret.