He didn't want to fight against them. Hades was, beyond everything else, an uncle. Zeus' brother. And he did genuinely love Hades, even if the sentiment wasn't returned. He'd already done enough damage to Hades.
And Aphrodite - well, all he wanted was for her to be happy. He wanted to be with her again. He wanted her to be there for him. He loved her so much... she saved him from himself; he was so desperate for her approval. He'd do anything for her - he'd give her anything because she was the centre of his universe.
He didn't mind that she didn't see him the same way.
"I'm not their whipping boy. If they hadn't fought over me they would have fought over something else; someone else. It was going to happen anyway - the pantheon is always fighting amongst itself."
At least, fighting over him, he had the opportunity to beat Hades up.
"I'm sorry that they've treated you that way. But she- I don't-..."
He didn't understand. He didn't see what was wrong with what he had. He loved her and she loved him and that was enough, wasn't it? All that he knew of love was what he had learned off her - it wasn't right to expect more, was it? What more was there to want?