Does he care about whether you are comfortable with the date location?
Does he care about whether you are comfortable in your outfit?
Does he care about whether the food is agreeable to you?
Does he notice when your feet is hurting or you feel lightheaded?
Does he notice when you are too hot and massively uncomfortable in your sweat-soaked attire?
Does he notice when you are too cold and trying to suppress a shudder?
Does he care about your safety and feeling concerned about you walking down the dark road alone after a late shift?
Does he notice when you got a papercut or a sprained thumb or something without you even telling him?
Does he notice when you both are out in public and you are feeling harassed by creepy man with the creepy stares?
Does he notice you are getting the beginning of a fever?
And the most important of all - does he care to take IMMEDIATE ACTIONS to solve the problem and ensure YOUR COMFORT?
And it has to be a non-performative concern - rather a silent one. Aka you don't even notice he notice, he observe you enough to notice the minute change and immediately took care of you. NOT because he wanted praise or recognition. He just care.
And of course it has to be consistent and never-changing no matter how many years you are together - because duh he ain't faking a persona, that's just who he is.