Had this happened two months ago, Miguel would not have minded Envy. Hell, he might've even told Tulio that 'hey, it won't hurt if he tags along for a while right?'
But things had happened, and the circumstances were different.

He frowned at Envy's quite petty argument. He 'didn't feel like' leaving. While it was mostly Tulio's decision whether Envy should come with them, Miguel opinion would matter. And if he knew Tulio right - and he was sure he did - it would matter a lot.

"What will you gain by travelling with us?" he inquired. Even though he didn't want Envy to come with them, he couldn't just outright say that.