Well shit, then yeah, we get another election, and RN might win this time. He's not about to buddy up with the conservatives, after all.

Is it possible he's talking out of his ass? I don't know why you'd kill your only option out of the gate like that.

Edit: Source, with specific place since it's scrolling coverage.

Also an interesting tidbit:

This is uncharted territory for France. Unlike other countries in Europe that are more accustomed to coalition governments, France doesn’t have a tradition of lawmakers from rival political camps coming together to form a working majority.

Edit again: The seats in the diagram are themselves coalitions of some kind. I'm not actually sure how it all works, but some of those seats will end up belonging to parties other than Macron's own, so maybe they could cross the floor and support Melenchon's government.