why am i so nervous, i really hope there’s like no cheating between them two

Don't speak this into existence T^T I would actually cry

I don't think there WILL be.

Ichii really loves En.

And apparently this new dude is psycho. Escaped from the ward.
Set up all those parties and killed all those ppl, one of whom was En, who had barely survived.

He'd been imprisoned for a long time now and Ichii has gone for a long time without a partner. He waited a long time for En to become his pair. There's NO WAY there is going to be cheating. At least nothing intentional.