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How old are you? If you continue pondering over such things you may end up getting Depressed and loss of Interest in your Studies. You will require anti depressants then. Don't spoil your future as everything happens for good. Kindly move on and concentrate more on beautiful things around you. Exercise regularly and eat healthy nutritious balanced diet like Fresh fruits and Green Leafy Vegetables. Avoid Junk and Stress
. Make sleep a Priority and sleep for a Minimum of 8 Hours daily. Practice relaxation techniques
. Avoid situations and things which make you remember your Ex partner. These steps will not only improve your External appearance but also your self confidence.
Wish you Good Health, Take Care.