Is a man most likely to fall in love with his attractive female coworker who he spends the week with, even if he has a girlfriend?

Let's say he was friends with her for a long time before he found his girlfriend. She just got out of a relationship and they spend hours talking at work. Do you think he's most likely gonna fall for her and leave his girlfriend?
Is a man most likely to fall in love with his attractive female coworker who he spends the week with, even if he has a girlfriend?
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