When you post you cannot abstract a part of the hand without analyzing or commenting the whole hand and your line of movement, for that you post (and to learn I guess), the one who answers you, will give an opinion of the whole hand including the range of the opponent that was your question.
If you are doing a post then you have to be more open mentally in my humble opinion.
About the hand: your line of play is not understood, what do you want to achieve with slowplay this hand? you have two pairs in the flop, aren´t the nuts, any set wins to your hand, so you have to defend those two pairs in the flop, how? with a bet, that way u are checking if the others players in the hand have some good hand or not, u bet there not only for value, for information too.
If you dont bet there, then you are let to the other players achieve their set or any better hand than yours in the other streets, and very cheap.
The villian could bet on the river with any two cards to make you fold, he was the big stack too, but if you said that he is a tight players, then I think he could had an A with high kicker, enough to win to you.
He could thought that u bluffed at river, and following your line of move in a whole hand, he did a good move to make you fold.
I hope I have answered your question and better luck the nex time.
