I’m sorry to hear about your break up, @
Shytan, but a problematic attachment style was actually the straw that broke the camel’s back of my marriage.
She was Avoidant and I am Secure, but living with an Avoidant was turning me into an Anxious.
The book I read was Avoidant: How to Love (or Leave) a Dismissive Partner, by Ken Kinnison. He said that an attachment style doesn’t change very much, so you either have to leave or accept it. I chose to leave.
To answer your question, I would say that attachment styles are weakly correlated to instinct and type. Meaning that an sx-last person might be more inclined to avoid people, and sx-last types are more prevalent in some Socionics types than others. But I don’t think the correlation is very strong.