Guys, why would a man be friends with his ex after he cheated on her repeatedly?

They have a child together (that he doesn’t bother to see.) And she’s also friends with her other ex too. I just don’t understand anything? Why do people feel the need to be friends with their exes? This makes me feel insecure, because I love him so much. But I can’t speak to him because of legal reasons. I’m just so lost.
Guys, why would a man be friends with his ex after he cheated on her repeatedly?
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