Why would a man stay friends with an ex and say she’s like a family but no longer date her?

All his friends know her, his family knows her, but they only dated for a few months many years ago until they decided to stay friends instead because they’d make better friends than romantic partners. He said he needed a different personality for a partner… They do sometimes visit each other for stay over and they might be friends with benefits. He calls her family but says the connection is not enough for him to pursue anything romantic.

Why would a man stay friends with an ex and say she’s like a family but no longer date her?
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