What is the relationship between a heterosexual man texting my wife and saying "I miss you, baby"?

There is also the possibility of making mistakes.

Or it's just a joke.

Maybe it was an affair. Try to find your wife's heart.

After all, your wife is different from you. If you love your wife, you should fully let her know how much you love her. No one else can replace you and let her know that only you can satisfy her.