50+5: I have 2 pair. Does he have a set?

[AA suited]

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

MP3 (t1000)
CO (t1000)
Button (t1015)
<font color="#C00000">HERO (t985)</font>
<font color="#C00000">BB (t1000)</font>
UTG (t1000)
UTG+1 (t1000)
UTG+2 (t1000)
MP1 (t1000)
MP2 (t1000)

Preflop: HERO is SB with 2[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img].
UTG calls t15, <font color="#666666">1 fold</font>, UTG+2 calls t15, <font color="#666666">1 fold</font>, MP2 calls t15, <font color="#666666">3 folds</font>, HERO completes, BB checks.

Flop: (t75) 2[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
HERO checks, <font color="#CC3333">BB bets t95</font>, UTG calls t95, UTG+2 folds, MP2 folds, <font color="#CC3333">HERO raises to t300</font>, BB calls t205, UTG folds.

Turn: (t770) 5[img]/images/graemlins/diamond.gif[/img]
HERO ???


Since BB bet out strong, i didnt think he had a set. I put him on top pair.

when he called my 3x check raise, i got concerned. usually on 50+5, a check raise screams overpair or set. but he called it. so i'm thinking he might have a set.

What should be my next move???

[adanthar]

He's still as likely to have AT as either of those and since he overbet the pot he isn't folding it.

Either you lost to exactly T4 (or, since you posted this, A3) or you had him beat on the flop/should probably put him all in now (or bet 300-400 just to make sure he calls one more).