How many bluffs did you recently show down at this table?
If any, I think he could have AA, KK, or possibly AQ.
If none, I think he could have TT, QQ, or be bluffing. The big reraise preflop could be someone trying to win TT without a flop.
Definitely feels like a slowplay to me.
Often when I don't understand the betting patterns lately, it seems to be because I've been bluffing too much and no one believes what I'm representing.