Based on the diagnostic criteria for AvPD it seems the risk of disapproval, criticism, rejection, shame and ridicule prevents avoidants from getting involved with others.
Imagine an intimate long term relationship where an avoidant managed to be themself completely without any negative consequences, In fact the relationship continued to blossom.
1. Would the avoidant eventually come to realise that this particular relationship is literally risk-free?
2. Would the avoidant's behaviour in this relationship eventually become more normal?
3. If you answered yes to 2, if something is still holding the person back from being spotaneously affectionate and intimate do you think they probably don't/can't have AvPD (and more likely schizoid or something)?
There's nothing in the diagnostic critera about what is typical about AvPDs who are in long term intimate relationships. I guess that's because either:
- there's are no tell-tale behavioural signs (they could be anything) or
- AvPDs do not get in long term intimate relationships (although if that were the case, the fact that they don't would be a good diagnostic criterion).