Will the birthday wish really come true?

This should have nothing to do with wishing or not. If you love him, you think he is unhappy, and you think you want to give him happiness, then ask him if he wants to divorce and stay with you. If he doesn't want to divorce himself, I think all you can do is wish him happiness, because if you interfere with him, it will cause bad reactions and be very troublesome. If you are really kind to a person, I hope he is happy. If he loves you, he will get a divorce.