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Q. If your girlfriend suddenly drops you to become a lesbian, is it your fault?
A. Absolutely not. If she now says that she’s a lesbian, that means that she already had the tendency to be sexually aroused by members of her own sex before she broke up with you. What might have happened is that she suddenly found the right partner and that sexual attraction became too strong to resist.
It is never the fault of the partner, even if you were not particularly nice to her. It’s natural to feel guilty, but rest assured it was not your fault.