Be happy for an ex?

So my last 4 years I figured out I loved him more than he me. In short I told him I was leaving and I wanted him to be happy. I just have no desire to be friends. He was upset. How is it weird that I don’t want to see him after we break up. If his happiness isn’t with me I don’t care to see it. Can someone explain this?
Be happy for an ex?
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