[TxMt] Project keeps re-adding a folder reference

I have a saved project. Inside my project directory in my HD are numerous files and folder like so:

Project/image.gif Project/layout/ Project/index.php

etc etc

There's 1 folder inside Project/ that I do not want to be included in my text mate project because this folder contains about 600 folders with thousands images inside. When it's included in my project TextMate takes ages to open it. So I delete the folder reference from my project within textmate, it goes away, great.

The problem is, even after a save the next time I open the saved project it automatically gets added back into my propject, I don't want it to and thus TextMate takes ages opening again.

What can I do?