When he compliments you or talks about you to other people, does he says things like:
"Oh X is amazing, beautiful, hot, smart, intelligent, amazing, make tons of money, knows her stuff, independent, strong blah blah blah..."
All filler words that he can pick and choose from thesaurus. Generalized nouns and adjectives that can describe you but also 22,345 other women. If you aren't used to being complemented you may feel like he is talking about you at first - but after a while you realize his "compliments" are empty and never truly describe you.
Or does he says things like:
"You know, X has this habit where she will refuse to step on the grass and willing to walk around it for 15 more minutes. She also cries when she saw deforestation videos. Like legit snot and red-eyes crying. She is... amazing."
A very personalized compliment that can only apply to you. He manages to describe you in a way that when people hear it, they instantly get a picture of who you are.
Sometimes he points up things about you that even you don't realize. His compliments may not sound like your typical movie romantic compliments (aka bombastic filler words) - but it feels genuine and honest. Shows that he has been looking at you and noticing things about you. Because that's how people love - they can't help but watch their loved ones and noticing things, big and small, about the partner.
Ladies, pay attention whenever he says things about you to you or other people - and observe what kind of words he is using to describe you. Is it all just filler words but ultimately empty praises, or is he describing you in the most honest, genuine way possible?