The reason I suggest Brit create a boundary about the obsessive use of the BB was to curb her annoyance. Clearly Brit's H is doing *something* he should not be doing. Why should she have to sit by and watch it and be uncomfortable? Let him have the discomfort, not her.
I do agree that his actions are very fishy. I had a boyfriend that played hockey once a week. This man was an athlete and participated in many sports and was in excellent shape. The day after his game he could hardly move. Hockey is a rough sport unless he plays in a league that does not allow checking.
