Please understand where I'm coming from.
Isolation is very much a staple of PTSD. It's not a given for everyone, but many of us isolate and isolate "hard".
I see you in much distress over this isolation. Is it fair for you to be in this relationship if you cannot handle the isolation? No, I don't think so. Does it mean there is something wrong with you? Not at all. Some people need constant/regular contact in a relationship. Some people don't. What I'm trying to say is that if you can't be ok with this isolation, then is it fair to you or to him? You both deserve to have your needs met. He deserves to have time away from his partner, and you deserve to have adequate/sufficient time with your partner. If this aspect of the relationship doesn't mesh well, then this may not be the best relationship for you.
Please don't take this personally. I have said something similar to many other supporters who come here after the first isolation period (which indeed appears to be the triggering event for why the majority of supporters join the forum.)
I hope you read other stories of supporters on the forum. I think you'll find that the long term supporters have found a way to work around these times of little to no contact so that the emotional impact on them is minimized.
It's good to step back and you do you while he does him. I know it's not easy.
I'm not trying to tell you what to do. I see things from the inside as someone who has PTSD myself. I am isolating right now myself so that's why I said that if someone asked me how much time I needed alone, I'd tack on punitive time. Questions like this only add more pressure and don't let us heal/recover as we need to in our own time. If someone is going to put pressure on me to get better by a certain time, there is the paradoxical effect of actually needing more time to heal because it adds more stress, and more stress means a longer isolation time.
I know it's killing you to just let things be, but I think this is the best you can do.
Also, if this guy was a jerk, I seriously doubt it would come out only now, only during a time of very high stress like this, after 2 years. I still think this is a very typical example of his stress cup overflowing.
PTSD isn't an excuse to be verbally abusive, but when that cup overflows, sufferers can/do snap at people.