Responses
I think it's more like an obsession. She is the one person in the world that he can't control, who is so very much like him but completely different. He created a delusion in his head so strong that he can't let go of it. He's not in love and love is not the reason he can't let go. He's infatuated with the delusion of obtaining the unattainable and control that which can not be controlled, completely possessing the one thing he could never properly have.
Why would Eros accept Medea's offer? Maybe I'm missing something, but she's made it pretty clear she's not on his side? Would it expand his influence and power? Or is that pussy too bomb and he just wants her?