I proposed one girl.She said NO.now she accepted my friend request on facebook.I still love her.what to do?

about 2-3 months ago I proposed one girl at college.She said quickly NO to me.Now we are not in same college.we have changed our college for higher studies.by this time she joined facebook & accept my friend request.we were not such as friends in college.I love her so much.how should I interact with her on facebook?