Scumbag 1 is like the greedy millionaire from Lilith's red carpet (Mairimashita iruma-kun), he has everything within his grasp, the moment he has su Luxia, his love will fade and an endless cycle of his pursue for lust will just keep going till who knows what, and that "wholehearted" proclamation is nothing more than to heal his wounded pride.
No 2 is prideful of being able to "protect" Su Luxia better, whatever rivalry he has with no 1 has something to say about that.