Sounds like you may have a split pulley that's actually in two pieces. This is sometimes done to facilitate installation of particularly tight belt installations or to allow the pulley's diameter to be adjusted for maintaining tension, although that's rare on passenger vehicles.

Best bet is to get a Gatorback belt (AutoZone) for your vehicle as you can't be too sure on a serpentine, especially one that may have been damaged, and put it all back like original. Get a Haynes book for your car and find out the details on the pulley so you can be sure it's put back with the proper torque on the fasteners. Be sure to inspect any bolt threads as they may have been damaged with the pulley wallowing around on them, which will mean either chasing with a die or replacement.

This should be a simple repair overall and sounds like a matter of the pulley fastener(s) coming loose. You may be able to gain easier access from below by removing the lower body pan which is typically held on by several 10mm bolts. It's been a long time since I worked on a Honda, but can source info from a friends shop if you need. Get the Haynes book though, it'll get you where you need to be.