Negging

A backhanded compliment or subtle insult designed to knock your confidence and make you seek the other person's approval.

What it actually means

“You are pretty for someone who dresses like that.” It sounds almost nice, but it is built to make you doubt yourself and chase their validation.

Also Worth Reading
Red Flags in Texting You Should Watch For
Red Flags & Green Flags

Red Flags in Texting You Should Watch For

Red flags in texting show up long before they show up in person. Inconsistent effort, pressure, guilt-tripping and a refusal to make…

What to do about it

Name it for what it is and do not chase the approval it dangles. Anyone worth your time builds you up, not down.