Why Does Someone Go Cold Right After Things Go Well?
Humans want the chase more than the catch, and the nervous system cannot tell those two apart. Someone cools off right after it goes well because of: 1) intermittent reinforcement, unpredictability is what made it feel electric and consistency kills the charge 2) the endowment effect running backwards, what they already have is worth less to them the moment they have it 3) avoidant attachment doing precisely what it is built to do, which is create distance when closeness lands. That stretch of silence is not confusion. It is a thermostat.
The pattern
Great night, then nothing for days
You get louder, they get quieter
You back off, they reappear
None of that is accidental
How the interest moves
Stop chasing for one week. The answer shows up on its own schedule.