Marriage is about trust.

If you think he is being unfaithful, then be unfaithful yourself, when you then find out he was faithful, he divorce is on your head !!!

Have you asked him ?

If he is, is it only a physical thing, no emotions, like going for a massage, would that be wrong, he is just having a specific area massage. As long as he comes back to you every time, then he still loves you. The physical act is mechanics, the emotional side touches the soul. The girls split the two when it is their ocupation, may be he can too.