Cally...I'm sorry to hear things have taken this turn for you.
If you intended to use the info in that file you created...why did you leave it sitting there on the computer for him to see? Why didn't you save it to a cd or floppy disc? IMO leaving it there as you did....just tempted him to erase it. Did you honestly think he wouldn't do that?
My advice, if you find anymore stuff on the computer save it to a floppy or CD and keep it somewhere safe.