The need for other's to validate you is a common trauma response. This can come from being judged early in your childhood for everything you do. Maybe you could "never" do anything right in the eyes of your parents.
You can also have trauma from a verbally abusive relationship as you got older and was told you would never be good enough or you were lucky to have this person. This leads to the need for external validation. Self Validation is the goal in healing that trauma