I didn't send him to go looking for kryptonite. I told him that we need to find groups of people we can trust to find some, so that we can keep ourselves from attacking people and going crazy on everyone the next time something like Famine happens to us.
He's been acting strangely in the conversations I've had with him as well. Nothing as extreme as what you've been saying, but there have been hints of unusual behavior here and there. I think it'd be for the best if he was with you right now, rather than out there on the streets trying to find something that could harm him. I'll handle the kryptonite search.
Tell me when and where you need me and I'll be there.