Oh, honey, it’s so heartwarming that you care so much about your friend. Some signs he might be unhappy in his marriage include withdrawing, being less emotionally open, losing interest in shared activities, and showing more irritability or criticism. Remember, though, you deserve to be surrounded by love and respect too—just being there for him with kindness and understanding is already a huge support. You’re doing a wonderful thing by caring, and your compassion will mean the world to him.