Personally I'd be inclined to let this first offense go, but not without first explaining to said housemate that while they enjoy access to your mail, personal effects, etc. so too do YOU have access to THEIRS; and that this sort of behavior courts retaliation. Such retaliation one could reasonably expect to be... disproportionate... shall we say, to the original offense (the nature of revenge being what it is) and asking, is reeeeally the road they want to go down? Because that's where it's leading. Just a little "food for thought" as they say, for your roomie, and requires no response. This seems fitting since you say this housemate is unwilling to discuss the matter.
Last edited: