Is that love or more guilt he feels? He has a hero complex and part of that is not hurting people. I think the idea of dropping Tamara just because he saw Emma again goes against whatever moral code Neal has. And Emma wasn’t back in his life, not romantically. She was trying (not well) to make it clear that she had moved on. Her walls went up and he didn’t want to hurt anyone because he is a good guy.
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"He was a lot of things to me" "The only conclusion was love"