Hate to say it, but are you familiar with Ladder Theory?
http://www.intellectualwhores.com Sounds to me like you're being set up for intellectual whoredom.
I mean, to be Devil's advocate here: she just up and decides to love some other guy more one day, but "still loves you". She either doesn't know the actual definition of love, is a total flake, or is nuts. Either choice, this isn't someone your heart is safe with. Get out now and don't look back.