That offers him at least 1:3 odds to call depending on his stack. with a set, a small flush he will call without any doubt, 2 pairs are too good to fold also, because on the board he may think you have wide range of hands that he had you beaten. A J is clearly fold. So you may got 75% sure that you will get called and go to river as a big dog. the risk/reward ratio is horrendous.