How did he play the other 5 hands he was involved in? Aggressive, passive?

This flop is a great one for you, so folding is out of the question on this street. Ultimately, you have to decide whether it's better to call or raise, and that depends on what you think his calling range is against a raise. If you have better than 50% equity against his calling range, it's a raise, otherwise just call.

Personally, without better reads I'd just call here.