I have a friend who has oneitis over this guy. They went out before in the past but broke up twice and are not going out anymore. He's a peculiar guy. He has no guy friends, all his friends are girls (hb3-5, girl im friends with is a

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He has repeatedly expressed interest in other girls and have asked several other girls out yet my friend can't seem to get over him. He has very little romantic interest in her, she's pretty much a plan B..maybe even C to him. a few of her friends called her out on her "beck and call" behavior toward the guy and told her to get over him but she just says they're just really good friends.
it's not doing her any good, she gets upset when he goes out with other girls or neglects her over someone else.
aside from telling her to read pua material and go out meeting a bunch of other guys haha, is there any way to help her?