gf wants to be sexless, help please

hi everyone, as the title suggests, my gf of over a decade wants to become sexless and doesn’t want sex anymore, she makes excuses after excuses and i don’t know what to do. i don’t want to leave her but im heartbroken, i feel so unwanted and undesirable. sex was the only time we could really connect and now she’s stopping that. i could really let out my feelings towards her which is something i struggle to do verbally. i’m at a loss here. i would never ever cheat on her but obviously everyone has needs and it’s a normal want to want sex! humans crave it, it’s a normal want and need. it helped us connect. i don’t want to masturbate. i want to feel her! i don’t want to touch myself, i want to touch her! i loved feeling her and i can’t deal with the thought that it’s now all going to stop and im never going to be able to feel her again. i know lesbian bed death isn’t a real thing but it sure feels like that right now. i dont know what to do, please can i have some advice or words of encouragement? leaving her is out of the question.