I suspect this happens because I can tell based on his IM accounts whether he's at his computer or not. And if he's not at his computer, I start to wonder. He was almost always on his computer when he was here because he almost never went out. And so now I want to know where, what, and who.
Hi Meghan. After I read this particular paragraph I thought I'd let you know about a little trick I have figured out for myself based on my own mindreading issues.
Whenever I let myself mindread, it's inevitably negative. E.G. Maybe he's joined Facebook to meet women, etc.
So, now, I force myself to offer a "flipped" version of the mindread as well. E.G. Maybe he's joined Facebook to see what I am up to.
Once I have both versions, I force myself to stop thinking about it.
It might not work for everyone, but it's been working wonders for me.