"How do I help him get over that?"

You can't. HOWEVER, you can push a little and ask him what he is still resentful of and just listen and validate. AFter he talks, go and give him a hug and tell him you understand.

M-43 W-40
2D - 9 and 5

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet a new life.

RECONCILED AND WISER