Ehhh, I'm def riddled with self doubt...even though, I don't like to admit that (dammit.

)
And I don't consciously know I'm doing it most of the time either. So really, if I didn't know anything about enneagram, I would not really know what someone means by self doubting. I come off as confident, even overly confident irl. But now I know what self doubt looks like for me. So I try to be more aware of it. That's the only way I can even really grasp the fact that I am, cause I have been denying it my whole life.
Anyways, the underlying meaning I got from your post is that you're situation has to do with being emotionally open. Please correct me if I'm wrong though.
But either way...I don't relate to your friend's description, simply cause I'm not that open emotionally. To anyone. So there's no......gap to rebuild...as you put it. Which really means I keep everyone at an arms length away, equally. At least to their face. I have no way of expressing emotions properly face to face.
I also would not like that ...what you described about your friend, that is. And that's because I like for there to be times where I don't see someone for 6 months...and I then we can pick right back up like nothing happened. I dislike when ppl are not flexible in that way. If I had to guess, the friend is not 6w7 are they? Cause the 7 is what keeps me opened up like that.
And just to clarify, I would say I put about 90% of myself (meaning trusting them, opening up to them, etc.) into a relationship. Right at the beginning when I meet them. And they either lose that trust over time...or it stays right up there at 90%. But no one gets that 10%. It is sacred. I have not met anyone that I could do that with (I don't even think I can trust myself with it lol). However, with that being said, hypothetically, if you
were one of those ppl I could do that with....I can totally understand her having to rebuild the bridge of that gap every time. Because for me, I know it would break me to have that 10% crushed.
And going by my very brief interactions with you, I'm sure you're one of those people that could bring that out in others.

But I can see how that could be a bit of a burden to have to do for someone with stronger preference of Fi, or even and sx dom like yourself.
My ISFJ friend always talks about how he has to take down his friend's(INTP) walls if they haven't talked in a while. It's a process. And just from hearing about his interactions....I know I would not want to do that every time I met up with someone. I would be exhausted.
(May I ask what your friend's MBTI is?)
Yea, I needed an example. I don't know if I interpreted her example the same way you did though. I don't necessarily think her perception is inaccurate. / Not sure yet.