Why would my friend still go after a guy that isn’t interested in her?

My friend is (44) and he is (43) but he wants to date younger girls. She’s never been married but she’s came close to being married.

she is going to a concert with him and she’s wasting her time because she getting her nails done and hair for this guy. I feel bad and try to get her to forget about him but she never listens

Why would my friend still go after a guy that isn’t interested in her?
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