Seeking Validation 

The act of seeing if what you’re either doing or saying is accurate using another person to bounce off of.

Yo man, he’s completely seeking validation with that.

Seeking Validation by Infernuscryxis August 16, 2018

Validation Seeking Behavior

Describes an action that is seeking external approval from others; typically to solve some deep-rooted childhood trauma.

That girl is exhibiting validation seeking behavior by posting half-naked selfies on Instagram all day.

Validation Seeking Behavior by iMonkeyBIZ February 9, 2020