The clinical significance of withdrawal in relationship is that it functions as both symptom and solution. A person withdraws because connection has become too dangerous, too demanding, too activating — and withdrawal provides relief. But it also provides distance from the very thing that could repair the activation: the other person's presence, understanding, willingness to stay. Withdrawal is often not a choice. It is a reflex.
The trap is this: the person who withdraws experiences relief; the person who is left experiences abandonment; the person who abandons reads the abandonment response as confirmation that withdrawal was necessary. The cycle is self-sealing. Each person's solution becomes the other person's problem, which becomes the other person's solution, which becomes the first person's problem.