i don't think this is so hard to guess. he probably added you to the friend list, than he would get a message every time you enter a game. if this is the case, if you will add him too, you will see a message of "mutual friend" if you keep the mouse on his name. if this happen often, try to make some print screens...
Yo mama so fat she uses Google Earth to take a selfie.
Teach me master how you want to see log of unhosted game which hasnt even started yet. Smartass