Men need the feeling of being appreciated. They need someone by their side to help them achieve what they want.
They need a woman’s support, emotional and any other kind. Women who show them these things are keepers in their eyes. This is closely related to kind of boosting their ego.
If you want to win his heart once and for all, compliment him. Tell him that he is successful, attractive, make him feel important about himself.
He will only love you more. You will leave the impression that you trust him and his judgment and that you are convinced he is capable of doing great things.
But don’t overdo it with the compliments. They can get old if you keep on saying the same thing.
Keep it natural and from time to time let him know what you feel and think about him.