Despite your lack of notes, you’ve identified the guy who’s in every hand and who bets every flop. Time at least mentally to give him the LAG label. Loose-aggressive. You’ve got his number. And you’ve finally got a good hand, better than top pair anyway. Call him all the way to the river, or the end of your stack, whichever is sooner. He'll not beat you this time.
Trouble is: LAGs have a tendency only to stick around when they do have a chance of winning or if they can bully you out of the pot. If you start picking and choosing the hands to stand on, they'll out-guess you every time.
THEY'RE NOT STUPID.
But it’s so much easier to believe that they are.