Why would a guy talk to his ex behind a woman's back while they're also talking?

Anonymous
If a guy is talking to his ex who is also his first love that apparently he hated because she cheated why would he still talk to her and keep up with her social media while talking to another woman especially over a year that he claims to like and want to be with? Plus still treating the ex badly even if it seems like he wants her back. What's the deal?
Why would a guy talk to his ex behind a woman's back while they're also talking?
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