The criticism tends to arrive at the worst possible moment. Not during conflict. Not after something went wrong. Right when things were finally feeling good.
That timing isn't a coincidence.
For someone with fearful avoidant attachment, closeness and the anticipation of loss are wired together. When a connection becomes real enough to matter, when there's genuine care, genuine investment, something that could actually be lost, the nervous system doesn't register safety. It registers exposure. And exposure, for a nervous system that learned closeness, eventually costs something and activates an alarm.
The alarm needs a reason. A justification for the distance that it's already decided to create. So it looks for a flaw. An irritation. Something that makes the exit feel earned rather than automatic. The criticism isn't a verdict on you. It's the nervous system building its case.
This is why the criticism intensifies exactly when things are going well. The closer the connection gets, the louder the alarm. The louder the alarm, the more urgently the flaw-finding begins. From the outside, it reads as rejection. From the inside, it's protection, running a program that was learned long before this relationship existed.
They're not pulling away from you. They're pulling away from what caring about you is starting to cost them.
Understanding this doesn't make the criticism easier to receive. But it changes the question worth asking. Not "what did I do wrong," but "what did the closeness activate in him?" Those are different investigations, and only one of them leads somewhere useful.
If this pattern is something you're trying to make sense of right now, Know your Attachment is where that work starts.