I would have raised him on the flop, if he called I would engage check and fold mode unless I improved. Players at $25 tend to call most bets after the flop if they like their flopped hand. Certaintly once he calls the $2 on the flop you have to give it up. On the plus side, think of all their $$ with your name on them when you do have a hand!

One of my pet peeves is also players who win a 'monster' and just leave, what are they planning on doing; running off to Mexico to live the good life on the interest!?!