what did i do wrong?

[DeeJ]

Welcome to the forum....

first, your description sounds like you lost but the cards you describe have you winning. Did he have 89 (not 9T)? All villain has is a pair of tens?

Call down from the turn re-raise (or fold if you can trust the read). You have odds to hit 2xA - or 2x7 which may be good. Call it 3 outs, you have about 15 in the pot, close decision. So probably call it down, if he is tight-unimaginative then you could fold the river. But, good thing you called because he is (assuming he had 89o) is rather more imaginative than you gave him credit for!

89 was the hand and the 3bet came from the cuttoff who is not imaginative, the BB had the straight