Hi Astromancer,
It is an understatement to say that such relationships can be quite difficult - wanting to be with someone, but never being able to get that commitment/stability nailed down in a way that feels permanent. I also know the silent treatment can be very painful because when someone has a wall up like that you might want to reach out but they just aren't in a place to let you in. It can get very ugly depending upon how far it goes. In his case does it go pretty far? When does he eventually let up on that?
You ask, "How do you cope when reaching out to him is impossible?" Firstly, in any relationship silent treatment is serious in terms of the viability of the relationship. Have you ever read those books by John Gottman? He talks a lot about that issue - of course that is for relationships with nons, but it may give you some perspective nevertheless. It is topic to take a deep dive into if you have the inclination.
In terms of coping, I have to admit, I mind less and less when I get at least a little silent treament because I want my SO to get himself under control. If he is doing just that, I am willing to give that time. No point in trying to push him into speaking or listening when he's not ready. The key is knowing when it's gone on just too long, in my situation at least.
But as for coping, perhaps you can help ritualize this kind of time for yourself in a way. Use this time for self-care, small things you can enjoy that bring good feelings and a little joy into your world. Perhaps even 10 minutes of meditation and deep breathing could help you soothe yourself and center your own thoughts/feelings?
I have gone through a lot of phases with such things. Sometimes I accept that I'll never really have stability in this relationship, other times I start planning for a future without him. I let all the thoughts come and try them all out. I am sure I will know what is right when the time comes. Perhaps instead of waiting for him to say things that would boost your self-confidence, and I know it is hard not to hear kind/loving words from our partners, you could do some positive self-talk? I know it might seem silly, but just saying positive things in your head like "I like me. I'm awesome. I'm a nice person." Whatever would make you feel good, and perhaps laugh even, would be a small step towards feeling better.
What typical things do you do to boost yourself in life?
with compassion, pearl.