I'm not sure I understand, because I have to agree with
@Friday , one week is not enough time to get to know anyone intimately enough to decide if either of you are compatible, without ptsd in the mix. I agree with the others, it is not as portrayed in a movie, and can result in what feels like very heartless, cruel and selfish behaviours. The fact that they are not necessarily intended to be heartless, cruel or selfish doesn't make them much less painful. I do think it takes maturity, ownership and constant hard work and maintenance to be able to manage and juggle stressors and demands of day to day liiving; it then also requires all that is necessary to make a relationship work. I would be a bit concerned when he says he doesn't know what he needs from you, because he shouldn't expect you to provide anything for him after knowing him one week, he should be apologizing if he has inferred you did something wrong. No one would know what someone else needs after one week, let alone with mental illness or injury present. But also, it may be helpful for you to determine what is acceptablle to you in terms of contact/ no contact, and communicate it and stick to it. (There is no wrong amount, but neither do you necessarily define it the same). Nor is isolation usually referred to as a few days absence after one week- it may well be absence every week, or months or even a year on end, or when things are important, or when you need help or support, or when things are good, or when things are bad (all are stressors), or when you don't see it coming at all.
I don't mean to discourage you. This is the getting-to-know smeone stage (usually takes months or years). PTSD is a very hard fight or battle. it can leave people and those who might care for them burnt out, depressed, hopeless, angry or cynical. It will have rewards, but maybe more tears than rewards, and things that can be traumatizing or hurtful. And often cheat you out of what comes much easier or more frequently without the prresence of ptsd. It is, as it is his challenge, all on him to address, cope with amd try to manage and overcome.
Just my 2 cents, ignore if you don't think it's relevant. Good luck as you go forward.