heres an idea that a couples therapist told my now wife when we were having a problem where I was not reciprocating my loved ones advances....

not everyone is "ready and wanting" at the same time. sometimes sex and hormones are controlled by many things...stress, past problems, medications, physical health issues, mental health issues, pressure to perform on demand.. even a persons diet (yes there are such a thing as some foods turn a persons hormones on or off).

that its ok for one to not want the other when one is "ready and wanting" thats why as human beings we have the capacity do things for our selves. to think back to before there was a couple and think about how you full filled being "ready and wanting"

there are many great books out there that teach a person must first know how to take care of their self and their own needs before taking on or having someone else "fix" those needs and desires.

my now wife learned its ok to go take a very long shower or bath and learn how to satisfy those needs when she was "ready and wanting" at times when I wasnt. I also had to learn that when my now wife turns to her how ways of satisfying her needs as those "ready and wanting" times happen is no reflection upon me and whether our relationship is going bad. and vice vera..its just natural for humans to do things for their self.

my suggestion is talk with your treatment provider or a treatment provider in your location, they will explain and help you to learn what you need to know about how your loved one is different from you and their "ready and wanting" may be affected by many things and how you can take care of business when your love doesnt want it as much, or when and how you do. they can also work with you on setting boundaries for when you are not "ready and willing"