*SPOILERS*
Despite it being long to make him fall in love with you, playing the cat and mouse game was certainly entertaining. The way he grew up and experience his sexuality certainly would make it hard for him to believe that this person is the right one, especially since he's backstory is rich with content (pun intended). If I was in his shoes, I wouldn't trust someone unless they fight back and want to earn my trust, especially if I'm showering that person with my money (a lot of gold diggers out there). But you have to admit the satisfactory of having Darius trust you and want to be with you was super rewarding.
Darius at first when I was doing Harolds story line was annoying with his sneaky comments every now and then but after diving into Darius story line and finishing to whatever was available, I was super duper in love with him as it made sense to his actions.