Why does does my boyfriend what to be friends with his former friends with benefits so badly?

My boyfriend had a friends with benefits that lasted less than two months before she ended it because she wanted something serious. Although, he did not want a relationship with her in particular (for bogus reasons he said that he didn’t find he attractive enough and she wasn’t outgoing enough), he has kept tabs on her like crazy and keeps trying to rekindle their previous platonic friendship.

What gives?
Why does does my boyfriend what to be friends with his former friends with benefits so badly?
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