At this time there is no way to officially break it off with anyone, however that may change in update 6 (I don't know right now). You can romance everyone that you have the point totals for but I am sure there will be consequences, no idea how large, as that is the nature of some of the drama we have now...So I’m guessing it’s ok to romance more than 1 simultaneously as long as we end up with 1 or none...or do we have to break up with 1 before starting another?