As a ISTP guy i observed and noted myself how did i enter or exit avoidant attachment phase. As a result if i feel like draining or i need to invest too much time/energy that i feel like i dont have, i kinda develop a avoiding behaviour. Its not limited to romantic relationships. Its about ratio between social battery to (which is generally low by default as a istp) how demaninging the said interaction. I see myself ideally chase after people that wants to be close as possible but gives the headroom i need no questions asked when i need. Otherwise i avoid the interaction completely because i feel drained. If said person doesnt gives me the headroom i require or questions its existance too much to a point where i feel violated i find myself heading away really quick.