What should I do if I receive an anonymous text message saying that my wife is cheating?

First, don't be credulous. If two people have a good relationship and don't hear the gossip at ordinary times, someone may have planted it.

Second, you must believe. Find someone to follow you, you can also look through her mobile phone, or you can find an excuse to "go out" and suddenly come back to see if this is true from several aspects.