Married 19 years, why isn't he angry?

I told my husband of almost 19 years that another dude kissed me, I kissed him back. I was devastated and truly upset with myself. My husband, on the other hand, is unaffected by it, it seems. He's worried about my mindset and didn't get mad at all. Is it crazy that I'm upset that he is taking this so well. I don't want a fight, obviously, but also like WTF? Need honest opinions/suggestions.
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So after some conversation, he says that he blames himself because he knows he's not doing as much as he could to make me feel loved and wanted. So there is that...
Married 19 years, why isn't he angry?
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