Good push or missed value?

Pot got big and I had a feeling he'd call. Am I supposed to be dropping the hammer on these or am I missing value here? After 39 hands villain is TAG and seems to know what he's doing.
PokerStars No-Limit Hold'em, $0.25 BB (9 handed) FTR converter on zerodivide.cx

SB ($29.55)
BB ($28)
UTG ($43.35)
UTG+1 ($20.15)
MP1 ($13.75)
MP2 ($9.75)
MP3 ($65.25)
CO ($9.90)
Hero ($24.50)

Preflop: Hero is Button with A:spade:, A:diamond:.
2 folds, MP1 calls $0.25, 1 fold, MP3 raises to $0.50, 1 fold, Hero raises to $2, 2 folds, MP1 folds, MP3 calls $1.50.

Flop: ($4.60) 2:spade:, 8:diamond:, 6:diamond: (2 players)
MP3 checks, Hero bets $3.75, MP3 raises to $7.5, Hero raises to $22.5, MP3 folds.

Final Pot: $34.60

he's testing you. I just flat call the raise and don't give him what he's looking for, a reason to lay down 99.

And on the turn, depending on how I felt, I might just check and represent AK, so I can win another bet from him.

I don't think you're line is bad though. If it weren't for the flush draw I would play it a tad slower.

I don't reraise the flop, just because of how much is behind. If you call here you are looking at a pot of $19 and you have $13 left...you can call the reraise on the flop and get the rest of your money in on the turn and river....I don't think he has the flush draw, so I think you are safe.

i will always say 3 bet this flop.
Your problems start when opp starts calling here or 3 betting/pooshing on you. Then its decision time
Flat calling here is ok, but very risky if your going to play a bigger pot on later streets. You hve little info on opps hand, other than he thinks you missed that flop