They don't disappear because they don't care, I know it seems like that¶

Avoidants pull away as a relationship deepens for four predictable reasons, all tied to fear of losing control and belief they will ultimately fail.

Key points¶

Emotional intimacy shifts from fun and light to feeling like something they could lose, so they shut down instead of leaning in.
Real relationships require accountability and consistency, which feel to an avoidant like surrendering the independence that keeps them safe.
As the relationship deepens, your needs become more visible and they interpret growing closeness as mounting pressure they will fail to meet.
Most avoidants don't trust themselves to show up long-term; they leave before they can prove that fear right -- running from exactly what they wanted.