Cat Not Wanting to Use the Litter Box

Last night I noticed my cat had peed on my bed, and earlier this morning he had peed on a blanket on a couch in his room. I clean his litter box every night and this is the first time he's acted this way. But this morning when I was cleaning up in his room, he used the litter box right in front of me, which he got a treat for doing so to try and encourage positive behavior.

It's just me, my roommate, and him, so whenever my roommate and I are gone he's alone. He has free range of the house and can go anywhere he wants, he's got his own separate room he can be shut in if needed but he's always by my side when I'm home. He's got plenty of toys and windows to look out of too, but he's alone for about 10 hours a couple of times a week.

Do you guys think he just being a jerk? Or what are your thoughts? I've been wondering about adding more litter to his box, he's very picky.

I'd love to hear your guys' experience with similar stuff, what you did, & how it ended!