How can a girl not want to sex after 15 years together but split up?

Been split for a year her or I has had sex been together 15 years we stay together sometimes we get along I even give her back rubs neck rubs I try to help her the best I can but she will not have sex with me she says nothing good will come of it but we both ok where we are what is going on
How can a girl not want to sex after 15 years together but split up?
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