I am willing to do MOST of the work in the beginning of a relationship...merely because it is an area where I have some natural strengths. But if the individual seems to be increasingly cold/distant...standoffish...I would probably interpret that as...'alright...this person does not like me at all'...and pull-back.
I had an INFJ in my life that wasn't the best with trust/disclosure/affection in the beginning...etc. etc. But he did do little things for me all the time. He didn't say much...haha. But he would bring me a coffee (and then run away). Or remind me of something because he knows I'm a total flake (I'm not kidding you). He did like Hux said. He stayed in my line-of-sight and kept me focused.
I'm sorry if you aren't finding the information here helpful. I did do my best! haha.