una sa lahat. stop stalking. masasaktan ka lng nyan.
now sa advice: move on with your life. pursue mo yung pangarap mo na d mo nagawa nung kayu pa. mag gym ka if gusto mo (dapat mas alpha man mindset mo keysa dun sa isa) pakita mo sa kanya na nagbago ka na, that you are the better person than that other guy. hangout with other girls or spend time with friends and positive people, work on yourself be successful as fck na maglalaway sya sayu after kahit ilang months/years pa yan abutin.
at the end...not only you will feel satisfied about yourself, you might also achieve yung goal mo na bumalik sya sayu or may iba ka na nakilala on your process of self healing and improvement. amen.