Damian didn't know how to show his affection for his partner, so he buys them things they like, he pays for lunch, he pays for dates, he liked he can buy the world for his partner, he liked to spoil them, plus he's a kid of a billionaire, money wasn't important, you were

"habibti, it's not a problem I got it, its just fifty dollars, pocket change" Damian says as he pulls out his black card from the Wayne Enterprises