I dated a girl for nearly 4 years back when i was 17 till 21. Most brutal feeling of my life when we broke up.. she hooked up with guys right and left and had a 2 month boyfriend.. and it was just hell and heartbreak for 1.5 years.. then i met a new girl and dated for 2 years (recently broke up which ****ing sucks).. anyway i was able to completely move on from the first one.
Now the first girl has a boyfriend and has been calling me long distance quite a bit and wants to be friends. So yeah i guess they do come back eventually in one way or another lol..