Me in his shoes, I'm thinking:
1) why did I call that big PFR w/86s?
2) I wonder if he has a PP higher than the board?
3) Because I called his flop bet (which was weak - should've been at least pot-sized to say "overpair") I think he's got AQ or AK which didn't hit.
4) I know he doesn't have a 3 with that PFR.
5) I've got top pair so I'll call down to see if he has the overpair I fear.

Your turn bet was also weak. You were willing to put in $2.50 pre-flop so a $2.50 turn bet says you're still drawing. Pop it for at least $5 if not $10. That might get him to let go fearing the Q.