Published on 12, July, 2020
NAS94922 said:if I hadn’t seen my partner in over a week and I was able to see them earlier I would take that opportunity.
I think this is quite important - you seem to be expecting his behaviour to be the same as yours, but you've already said you are both different neurotypes. If he is very literal, he would know that you have organised your life around him not being there for X days, so if his plans change he would not assume you could adjust your plans at short notice, if that is what he would do. Have you said this, told him that either you are free or that you can change your plans to accommodate his change?
I don't have a partner, but when I did have one, I always needed to balance couple-y time with alone time and friend time. This can be hard to keep a balance that keeps me healthy, in itself being exhausting, before I've even arranged to see someone! I stick to arrangements once they are made and rarely cancel. If I suddenly had 'free' time because someone cancels on me, I wouldn't think that another person could suddenly be available to meet me, so I'd stay home and read a book, or do something on my 'to do' list.
Also he is not prioritising his friend's needs above yours, he is prioritising his own needs. At this moment he perhaps needs to see a friend more than seeing his partner.