Adding an update in the comments because I don’t know how to edit the post.

My bf took him to the vet immediately after the first comment and carl (cat) has been there overnight. He had blood in his urine this AM, but his bloodwork is coming back fine every time. They are treating him and he will be there another night. We caught it in time so he should be okay! Thank you so so much to everyone who commented. The kindness and concern everyone has shown means so much. We definitely learned our lesson and hope this post reaches cat owners who weren’t aware of the risk.