Villain is a fish, more on the aggressive side but not out of line.
There is a chance he was also tilting at that time since he lost some big hands.
Since he may be bluffing, is there a reason to check behind here in order for him to bluff river?
If I bet he will fold all his air.
I assume he doesn't have much of a hand since he would be betting anything strong.
We are also very deep and I could definitely miss some value if I check behind.