If he didn't push the river you just lost alot of value from AA playing this way. Raising the flop to say $4 or $6 builds up the pot and he may 3bet anyway. If he checks the turn, put out a 1/2 bet which he will probably call. Then by the river he's either leading out or calling a value bet (or possibly folding).

Say you play it your way. The pot by the river is ~$15. He only put in $7 and does not feel committed if he wants to let it go.

Say you play it my (ultimate best - no discussion) way. The pot is ~$15 on the flop. Even if somehow this is checked down, you got the money while you could. If he folds to your flop raise - he doesn't have a hand that he's willing to put much more money in with anyway.

Slowplay = slow profits in most cases. You just got lucky (or unlucky) here.