I don't think there's anything wrong with Ritzy. All of my cats have gone through stages where they are more cuddly and others when they are less cuddly. Elvis loves to sleep with me, but lately, he has discovered the corner of my room, on the rug right near the radiator. He has been sleeping there almost every night. I miss him in the bed, and he does come and sleep with me for a while, but usually ends up going back to the warm spot.
When I put a basket lined with a baby comforter in the living room, he spent most of the night there. He still spends the night there occasionally.
I think that they just find a spot that they like, and it becomes the favorite spot for a while.
I know you miss the cuddles, but I don't think you should take it personally.