Why does he call my bluff?

[pipergsm 0]

Hi guys,

I'd like your advise on this one.

Playing an online MTT for 150K prize money (total), 7K first spot.

We're in the money, bb=20K, I have about 400K and villain is bigger with about 800K.

I bet 2,5 bb from mp with JTs, villain calls on the button, pot is about 105K, we're heads up, Flop is 95A rainbow.

villain bets 35K, I call thinking he doesn't have A. Turn comes 5, check check, still rainbow.

River comes 9, we now have A9955 on the board. I bet pot 180K, or about 60% of my stack, villain finally calls with AK.

In my opinion, with the way I played this I could have very well had a 9 here (T9s, J9s, K9s, Q9s, A9s), which would give me at least trips or maybe even full house.

Would you have called this bluff?

If so, why? Should I have gone all-in?

Thanks for your reactions!