Go for a quick drink, somewhere public, the pub or a bar, but decline any offers of going back to his place or anything if you do go.
Before you go say that you hope this is just a friendly drink as you dont feel ready to move on yet and you are enjoying being single at the moment and are re evaluating yourself, but you are happy to have a drink. He might be just being friendly but if its more ask him, it wont hurt and will avoid alot of explaining from you at a later date-but dont lose out on a potential friend he might turn out to be very a nice person