hmm well it's either he's bluffing, or he has a monster that he's trying to get value from my overpairs with.

sounds like everyone thinks his bluffing frequency will be high enough to warrant a call. Seemed close to me.

We have a lot of history but i'm not sure how to describe it... mostly i've been running real good against him and almost every hand for more than $25 seems to involve a nonstandard line from one or both of us. I'm not 100% sure how that affects this hand.