Most Helpful Guy
I would generally make absolutely no attempt at contact whatsoever. In the situations where an ex contacted me, I usually either ignore them, or (depending on the situation leading to the break up) would just tell them to f*ck off.
It may not necessarily be healthy, but I tend to get over someone by making myself hate them, so at that point, I don't want anything to do with them. Like, to the point that if they got hit by a bus, I wouldn't lose sleep over it. There have been a few exceptions, but on the whole, that's just how I am.