My Aspie mom has been married three times, and all three times shared a room and a bed with her husband. (Only the third marriage ended in divorce, and he was an absolute jerk so he deserved it.)
Why does the thought of not sharing a room "devastate" you? I don't really understand that. It's actually quite a common thing.
Apparently, in a survey done of NT couples, about one-fourth of all couples sleep in separate beds--
Article: Should Couples Sleep in Separate Beds?
Every spouse needs their own space, to some extent. When you're married, you'll probably want to do your own thing sometimes--go out with your friends, do your own hobby, be alone so you can think or solve a difficult problem. If you were always, always, always joined at the hip to your spouse, you would start to hate each other eventually. That would be true whether your spouse was NT or AS.
People with AS are often introverts. About a quarter of NTs are introverts; for Aspies it's more likely. That means that they need to be alone sometimes to relax, and that they like to socialize in small groups and prefer to get to know you one-on-one rather than hanging out with a big crowd.
So just like you will need some space, your spouse will also need some space to him/herself. It's really not too much to ask, is it? It doesn't mean they don't love you. It doesn't mean they don't like cuddling with you.
There are many reasons that couples (whether NT or AS) might sleep in separate beds, including--
A member of the couple snores or tosses in their sleep, sleepwalks or sleeptalks, or generally disturbs the other's sleep at night.
They want radically different sleeping environments--say, one person needs quiet and dark and the other wants to have a night light and soft music playing.
They have different sleep cycles, such as when one of the couple works the night shift.
They are asexual and don't have sex, so they don't need to sleep in the same bed. (Plenty of asexual couples do like to cuddle at night, I am assuming the two of you are not asexual.)
One of the two is a very light sleeper, has insomnia, or otherwise sleeps better alone.
Reasons specific to autism include:
Sensory sensitivity means that the AS member of the couple wants to sleep alone because physical contact with his/her significant other is so intense for him that it keeps him/her awake (intense, for the record, is not necessarily bad).
The autistic member of the couple needs a space to be alone and relax, away from people in general, or where s/he can engage in special interests.
The NT member of the couple needs a space where s/he can entertain friends and hang out.
Autism-related sleep disorders (insomnia, odd sleep/wake pattern, etc.) make the couple's sleep cycles incompatible.
When a couple has separate beds, the usual arrangement is that one member of the couple will sleep in a double bed in the couple's "regular" bedroom, and the other will have a single bed in a spare bedroom. It doesn't mean "no sex"; it just means that they sleep separately.