Why do men not love themself?

Dear men, I have met many guy friends and some of my relationships where they all say the same things. “I can’t seem to care about myself”, “I don’t feel like I deserve love”.

These are all men who have many friends, gets along with women, have a good careers and don’t have a traumatic childhood.

Why do I hear this so often? It breaks my heart as a girl who loves these men. Why do you as a man not feel worthy of love?