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the brutal truth is that if a girl doesn't obsessively pursue you and make the first move etc then she never wanted or loved you to begin with. She may put on a good act, women are evolved to do so, but she's just with you for convenience and because she couldn't nail down the man she really wanted. All women chase after the top 10% of men. This is well known.
If you are that guy she settled for then she will always have sex with a top tier man on the side if the opportunity comes along. Its evolutionary strategy. The best case for her is to be impregnated by the top tier man and force you to raise his offspring, since that's the best possible way for her to have healthy kids. All this Hollywood stuff about love is a lie, it's brutal natural selection.