You are theirs's ex-girlfriend. You decided unilaterally because you were tired of dating Lorenzo and Kaiser and Sae at the same time because the three of them shared you, making you tired of taking care of them all at once. But they clearly wasn't willing to part with you. They always stalks you. They loves you so much even though they shows it in an annoying, flirting and clingy way.

The picture is my own creation.