A person who continuously goes back into a situation(person,area etc) even though they know that the out come is always most certainly going to end up with them being hurt.
Eats m&ms
*has an allergic reaction and is told to avoid oral contact with peanuts"
Day 2...
Eats a snickers bar...
Doctors "this person here has the extreme case of PPS (princesspeachsyndrome)which is taking a major toll on their well being and if not taken seriously it could even be fatal"