Hi there,
Not a psychic but, try apologizing if something went wrong between you two. Tell her how much she means to you and how much you love her. And if it was something really bad that split you two up ask her what went wrong and if push comes to shove maybe enroll in some relationship counseling. I can tell you really care for her but be sure to give her some space she may still need it. Then when you feel the time is right slowly approach her and tell her what she means to you. Good luck to you both!