How do guys feel about their girlfriend leaving them for a woman?

I think I've been bi for the longest without realizing it. Though I suspected it. I want to break-up because I want to be with my friend Sonia. She reciprocated interest in me and we want to date.

I'm going to leave him for antoher woman. How do men feel if their girlfriend break-ups to be with another woman?

How do guys feel about their girlfriend leaving them for a woman?
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