"What do you mean, another?" Apollo asked, offended. Jilted?! Sure, she wasn't wrong with 'lover' there, but he was not the one who had done the jilting, thank you very much. She'd chosen Ares and her son and a dead mortal boy over him, becoming one more in a long line of women who'd jilted him. A line that (he wasn't going to point out right this second) included Rosario's mother. How could she assume he was the one who'd done the jilting?
He tried to be patient. She was upset. Saying things she didn't really mean to get at him, things based on preconceived ideas she refused to let go. "No," he said, like a calm and rational person. "She's the Muse of Tragedy, actually. So if you insist on not becoming one, it would be wise to stay away from her. This is genuinely good advice," he added, just to drive the point home, and didn't even add a you're welcome, even though she was.