No solos anymore

“Vinnie, do not do that”, Modo muttered.
“Or what?”
“Or i'll return to Mars forever”, Modo growled and get up. “I will never talk to you again.”
Vinnie blinked. “Okay, if you say that, that's ok!” he growled and turn off. He was very sure Modo was just cheating him 'cos he was angry. But he was not even sure. They never talk about Mars, and Modo never were there when he and Throttle were talking about their old homes.
Was Modo meaning that?
“You're not cheating..”, Vinnie sighed low.
“No”, Modo came to his side. “I just wish i could be serious, but you know i can't.”
“So, you only say that because..”
“Because if i lose you, i want to die”, Modo looked at him. “You can't decide to doing this, not after  we are..”, he toughed him. “I'm sorry, but i can't let you do that..”, he kissed him.