I don't think one gets over or "lets go" of something or someone so much as moves forward toward something else. We can only concentrate on one thing at a time and if one looks "back" and concentrates on what one had/wanted/wished for in the past, one cannot move forward because they're facing the "wrong" way? My first love, when it broke up, was "cured" after I got a new job and was doing new things and meeting new people, etc. I found someone new in that new situation and the old situation and person did not have any hold on me anymore.