villain is unknowed

first of all, do you guys think its okay to 3bet JTs vs CU on the SB?

should i continu betting on the turn? i pick up some extra equity with a gutshot and villain can easily have a pocket under K, i block JJ and TT but he can stiill have QQ for sure too in his range

i decided to fold turn cause OOP like that i dont feel like im gonna get paid that much on river when i hit.

could i check raise semi bluff turn? would it be a good move here?