if you're bluffing, you need to be aggressive. Need to raise more than a minraise on the flop. Need to pot the turn.

I don't like trying to get this pot at all though. Here are my reasons.

-For all you know, he has the three.
-The pot was tiny.
-Your hand is probably not best.
-He bet the flop, meaning he likes his hand or he's bluffing.
-He called your raise, meaning he probably isn't bluffing.

This pot is just not worth going after, beyond a flop raise, and even then I don't do that. If you raise preflop, there is enough in the pot to then go for a steal on the flop. But right now you've committed 25 cents to this pot, and you're probably behind against someone who obviously likes his hand a decent amount. You're just not in a good position to get this pot.