Syag,
I’m not at all privy to your situation, I don’t know any details, but it could be it’s a bit harder to accept wholeheartedly when another person is involved. He is viewed as the the “source” of the misery, pain, hurt. I too was dealt a strong blow from a “human” some time ago, I really should know and realize Who was behind that “potsh”, Who ordained and planned it, but it doesn’t come so easily, it still hurts. The heart and mind are in two different places. It takes a lot of mussar and training to get to realize that. And once I do, I suppose the hurt will be less.
I wish you a full nechamah, closure, consolation over your pain.