If I had no reads on my opponents playing style, I'd probably fold.

I base this decision entirely on this article, located in this forum's stickies:

http://www.flopturnriver.com/phpBB2/...oker-32893.htm

Basically, the article says that at low stakes, if you hold TPTK or an over pair, then bet 1/2 to 2/3 of the pot and are raised, then you are most likely beat. I play $10NL and have to say that in my limited experience, it holds true.

Just a guess here, but I'd guess that the villian was holding A 3 suited.