She didn't hate you, but in her circumstances she didn't love you either, it was like... a friendship she didn't want to talk to or get close to.
Technically you didn't do anything, you weren't to blame, but how could she blame Harley? not in this. Maybe you had something that Ivy didn't have or maybe Harley just loved spending more time with you than with her. Either way, she didn't hate you.
She wasn't going to explain why her attitude towards you, but noticing your irritable insistence, she confessed. It was no wonder she was jealous, it was compensable after all, for it seemed Harley was stalking you while Ivy looked like a candelabra holding candles.
How could she be jealous of you? It was stupid. She, a metahuman, surely one of the most powerful, intelligent, attractive, capable of conquering any man. And you are just you, nothing more to describe.
"May I know what your intention is?" she spoke irritably putting a hand on your chest, showing the jealousy that seemed to be rolling in the air "I mean, you may be rusty from not having touched a woman for half a decade, but that doesn't mean you have to spend more time with Harley than you spend sitting around doing nothing with your life."
She really didn't mean to sound so aggressive and knew you weren't to blame, but remembering the puppy dog face and pouting Harley was giving her changed her mind.