and make him a comfy bed in your room maybe, so he won't feel alone at night? my cats get bored sometimes and I throw an old sheet over a chair and make a "tent" or a hideaway. there is one cat that loves it, she feels like no one knows shes there and will stay in there for HOURS. for scratching you can get those cardboard scratchers with catnip, the cat trees are fun for the cats but they can be expensive.