Well Yes and no.
One thing I've noticed is that some people are natural extraverts and relax by being around people. Some people (both my lady and I fall into this category), are natural intraverts and relax by being alone. It's not that an intravert can't deal with people, it's just that intraverts (as is my case), aren't able to relax unless! they're alone, and must spend some time alone in order to recharge.
I noticed in recovery though, this tendency got rather extreme with me. Being around people started to take so much work, I ceased to bother, indeed I had points where I'd physically not leave the house for four or five days at a time, just because I couldn't muster the energy to deal with people. This also counted my parents as well, indeed when I was at my parents I did the same thing, spending hours in my room, even more than usual.
It was not a good state, indeed it was in some ways an addiction, albeit it was a necessary state at the time, though kicking myself out of it was difficult at various points, though it wasn't helped by some diatribes from my mum on my own failings as a person or her essentially trying to blaime me for where for my own state. (her calling me autistic really didn't sit well and just succeeded in really annoying me).
I would suggest therefore a combination of realizing that he needs some space, not making him feel guilty for needing it, and letting him know your there.
I'll also add however, this is one thing with my lady that has worked out extremely well. Firstly because to my own surprise I'm finding that despite always needing my own space in the past, my own space can quite happily include her, ie, I can relax with! her as easily as with being alone, and secondly that because we're both intraverts (stage performing not withstanding), we can both be together and separate in a very helpful way, eg, one of the loveliest things we can do together is cuddle up together each while reading our own book (we're both avid readers).
We also do things together, books, music, films etc, but being able to each have our own space but be physically together and not bother each other is a truly wonderful experience, indeed right now I'm in the living room with my desktop, and my lady is in the bedroom reading, (she would be here on her own computer but for the fact it's on the blink).
I suppose working out adequate personal space is always a bit of a thing in any relationship, it's just that intravertion combined with being a surviver might distort things unusually, particularly where guilt is concerned, I know I worry for example when I say go and play a computer game or do some volunteer work for the website I write for even though my lady is just as capable as me of amusing herself on her own, indeed just as capable as I am.
I hope some of this is vaguely helpful.
Luke.