3 things

Good - When you run into a friend of the ex- and he says you look freakin great. woo! nothin like an ego boost to make the day easier to deal with.

Bad - When you find out the same ex- has categorised you as a nightmare, with his truly mad ex-girlfriend.

Ugly - Especially a low-blow when he was the one that cheated on you with said ex-girlfriend thus leading to break up.