What if...what if him locking himself in the room got you a "treat" and was a good thing, instead of a bad thing?
Right now I'm getting the idea that it happens in times you wish you had a connection with him or times come up when you want connection and he is locked away.
So...what if you see him locked away and went out for coffee and bakery treat...or maybe there is a massage place you can get in on short notice (you get the idea).
Am I correct that you "wait" on him to emerge?
What if you didn't "wait"? So on Friday he locks himself in and you treat yourself to a weekend away. He emerges and freaks out that you aren't there and reaches out.
Instead of you freaking out in return..you stay neutral and perhaps are sad he missed out on life...quickly pivoting to planning a future weekend together. If he pitches a fit and misses that weekend..guess what...you go.
Wash rinse repeat until he realizes that his acting out impacts him..but not you.
How does this sit with you?
Best,
FF