Guys, Why would a guy do this?

Why would a guy talk bad about his ex and say she's crazy but still continue to hangout with her and talk to her? By the way the guy im talking about, him and this girl never actually dated but almost did. He told me they didn't date because he found out she's crazy. Yet he still hangs out with her and talks to her?
Guys, Why would a guy do this?
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