How to find spouse?

I am curious on if anyone has any ideas on how to find someone’s wife?

I have tried messaging his family and friends that I can think of. But none of them will respond to me. They are all ignoring what he’s done. Apparently they are ok with him cheating on his wife of 10 years with multiple women.

He now has me blocked on his social media so I can’t even double check that. He’s also military so he didn’t have much available to see in the first place.

So confused on if there is anything else I can try.