I agree with the others - I would only crate an adult dog if he had potty issues or couldn't be trusted on his own in the house. Melonie hasn't been crated since her first week in our house. She sleeps in our room and doesn't seem to go anywhere during the night, other than maybe moving from our bed to the floor or vice versa. Jameson is crated because he's newer to us (less than a month with us) and he's really, really mischievous - he's been putting his paws up on countertops, putting his nose into everything, etc., so I don't trust him unsupervised. As soon as I feel like I can though I'll be getting rid of the crate. Unless your pup has issues like that, I'd just let him roam if you feel bad.
Also, definitely get him a few more toys - something that will entertain him, not just for chewing. Something he can rip at, kongs stuffed with treats, that kind of thing. How much exercise and interaction is he getting?