[KenProspero]

In my humble opinion.

4-4 against a heavy bet is, at best, a coin flip. Given the above average raise, you may well be looking at a higher pair, which kills you. All other things being equal, I'd fold in this case.

However, you thought you had a read on the player, and you played based on your read. Though I'm not personally not there yet, the ability to read your opponent is what makes a great player great.

In this case, however, most of the time, even if you read your opponent correctly, it's still down to a coin flip. i.e., 5-6s is about 50-50 against you, so I'm not sure how helpful it is long term to bet here even if you think it's a bluff.