My wife often contacts a man and sends messages, but she won't let me see why.

Well, women are playboys. Don't think it's just men. Are you not good at something, or are you too busy to spend time with her? Women can't stand loneliness, and some things are not so secret. Please find a time to ask her what is going on! Didn't you say you loved her? But why don't you believe her? She won't betray you if she loves you, but she won't be forced if she doesn't love you. Feelings will deteriorate over time. You don't trust her, and you don't tell her if you have any questions. How can you work it out? How can you fall in love with her with such suspicion?