I would run a spyware program to check if he has installed a keylogging program on your computer. Im not sure if you are aware that a keylogger records every keystroke you press and many also track sites you visit. Some even take screenshots at intervals.

Do a google search for a program called SpyBot. It is a free program that can detect most viruses, malware and keyloggers.. and then delete then from your computer. I use Spybot frequently and have never had any problems with it. Even if it finds nothing on your computer at least you will have some peace of mind.