the pretty much hits the nail on the head^^ but legit though treat him how you would wanna be treated. don't be a jerk, don't blow him off 24/7 and ik theirs always that old saying bros before hoes and girl-code and stuff. follow it but don't completely blow him off. find time for both friends and relationships.
She shouldn't make the guy do all the work. When it comes to who pays for the date they need to take turns. She needs to show him she loves and respects him just as much as he shows her. There's not really a set way she should act around or treat him. It all depends on who she is and your relationship.