If a guy has been emotionally entangled with a girl that’s not his girlfriend long term what does that mean?

I mean like he started seeing his girlfriend three months before meeting the other girl, but he’s been emotionally entangled with the other girl for over a year what’s that mean about his feelings for both?

Like he’s half in and out with both, won’t leave his girlfriend but can’t give up the other either.

If a guy has been emotionally entangled with a girl that’s not his girlfriend long term what does that mean?
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