For NTs being friends often means that they have more need to see each other then I can offer. When my partner and I meet new people, there are some that like us, and would like to meet us more often again. But I cannot manage to meet people that often, specially during week, when I had to work before and need the evening for relaxing. Because of us then so often negating invitations, for many sadly it seems as if we were in generally not interested to meet them.
I do like to go out with people and have fun, but I simply cant do that more often then once every two weeks, as well as doing normal visits to or by friends more then 1-2 times a week, is for me very burdening.
As well that sometimes, I simply have really bad days, where I cannot visit people and if they have invited you to a birthday or a party, and then you need to tell them on the same day, that you cant come, because of feeling not so good, some start to think bad of me, specially when that happens more often. So it seems to them, that I am simply not interested about visiting them, and so would tell them excuses, when in reality I am myself sad, about being unable to go there.
It makes me really sad, and I can as well recognize peoples disappointment, which makes me sad as well, but I cant help it. I tried to force myself to go to such things, ignoring, that I felt bad that day, but that only ended in bad ways.
Sucks, but I have accepted it by now. So most of the friendships or potential friendships I loose, is simply because of the small amount of social contact, that I can offer.
Loosing common interests with friends also sucks. If there is only one thing that I had in common with a person, and that person changes the interest, it is hard for me to be in contact. So even when I like that person, socializing with him/her becomes a pressure for me, so its no fun anymore. And because of me having in general less ressources for socializing, spending an evening with a person that I dont share an interest with, and so makes that evening fun instead of work for me. Which pretty sucks, if you hardly are able to socialize once a week, so one week you force yourself to meet a friend that has no interest with you, so you cannot enjoy that. Next week is wasted with an forced "family day" that drains all energy... so all of that forced socializing out of polite reasons, often leads to me having only 1-2 social events a month, that I really enjoy on myself. Sucks.