We had a 'fight' that made her drop the exclusivity. The fight being her going on a date behind my back and me not giving her the benefit of the doubt. (Can u imagine this logic?
i had a couple of girlfriends like this in my time.
its as though exclusivity creates too much pressure. one of my first serious girlfriends in high school told me she "becomes a

" when things are official. told me she wanted to be with me, but thought it would be better not to have that hanging over us.
and yes, a month later, she left me for another guy

partners that do this struggle a lot in relationships. there are a billion anxieties that they dont fully understand, and you only really get a glimpse of.
there was a lot at play here. she had an unresolved relationship, and that tends to spell doom for whomever gets involved in the mean time.