Sketchy turn 3 bet?

[nokia1566]

I was just thinking that my 3 bet on the turn may of been questionable because if he indeed had top pair then does he call the 3 bet without a heart? And if I do 3 bet and he calls (does he do this enough w/ just 1 pair no draw?) do I still bet the river (thinking that he probably has a heart or has me beat w/ some other hand) if he calls the turn 3 bet?