The husband goes on a trip with his wife and colleagues behind his back, what should the wife do?

Since you said you were cheating on your wife, you can be sure that the colleague is of the opposite sex. As a wife, is your information conclusive? If so, you should quietly collect evidence, the more the better, including witnesses, physical evidence, audio and video materials, etc. Don't expect a cheating man to change his mind. Even if you forgive him, he won't feel the same as when you were in love.

Once enough evidence is obtained, let him leave the house!