Well, busy schedule does not bother us when we are passionate love and crazy about the partner. She could ask you come, massage and comfort her sore shoulder after long hours of work. For some reason, she stopped to invest her effort to the relationship.
She became distant first, and finally dropped the ball. It is typical breakup.
Don’t fall for “I still love you” crap. We do not run away from the person we really love. It is just empty word. Please be strong, heal and move on. As others suggested, please do not attempt contact her to beg. Take good care of yourself well, friend.