Villain is a 41/18, AF 1.5, 3B 9. Have seen him 3bet with TT before and calling raises from the SB with AJo, AQo, QJo, so i decided to defend with AQo Preflop and with my gutshot + Overs on the Flop. On the Turn i happily took the Freecard and when the hearts-flush came in and i had the Ah I thought a Bluff on the river would be a nice idea if he checks again. But he didn't check. Instead he bet ~50% pot. Pot was $1.63 and he had behind $1.06 behind.

Question 1: Was my idea to bluff if he had checked a good one, and if yes, what size would you do it with? If Iput him AI here, he gets 1.7:1.

Question 2: As the hand continued, makes a bluff, that puts him AI, still sense or is it nonsense and I should i fold? If I put him AI, he gets 3:1.

Question 3: As the hand continued, how big should his stack have been, that the bluff makes sense?

Thx already now for your answers.