Atorvastatin: I'm not playing scared per se because I have more than 20 buyins for 50 NL. But (like everybody at the lower limits, I guess) I've lost plenty of big pots thinking "naaah, they CAN'T have that straight because that'd mean they called off virtually all their money on a gutshot draw", and you know what? They did, lol. So maybe I was a bit gun-shy (cautious), but that's just natural I think.
Kalle: Definitely. I've seen people do that many times before - a flush made with small suited connectors trying to shut a higher flush draw out. This was one thing that crossed my mind and maybe did lend that extra little bit of credance to the notion that he did have the flush.
At the time, I just couldn't bring myself to commit all that money as a possible underdog drawing to a house. I can't believe that anyone can reasonably say 'if you are convinced he has the flush, call anyway because you are only a 2:1 dog'. No-one wants to stick their money in as that much of an underdog.
So in a way I'm happy with my decision to lay it down because I was convinced he had the flush. After all, you've got to go with your instincts, no?
But I'm not happy with my instincts
and should've reasoned it out more before making a decision. And that's where all your advice has come in useful - thanks guys.