Regardless, the fact that Shane had decided to stay was already set in stone.
He didn't want to explain, as explanations would only make things messier; others simply wouldn't believe him. Continuing to explain might lead to a heated moment where he could say something wrong, and then that fierce little she-cat might jump out and bite him again.
So, Shane could only speak up, sounding deflated and powerless,
"Anyway, I'll be staying in the Royal Capital for a month, it's fine if you all head back first."
After all, in the Royal Capital, Shane had become somewhat familiar with things, and he should be fine staying on his own.
Of course, he had to discuss it with Migis first. It wouldn't be polite not to say something after eating and living at someone else's expense.
However, after Shane announced his decision to stay, the group of girls had this to say,
"Since you're staying, then I might as well stay too."