1. Reinterpreting uneventful/mundane thoughts memories or objects
2. Idealizing the decease by redefining negative qualities
3. Continuing pre-death bonding activities such as annual vacations, going to the movies ect
4. sanctifying meaningful symbols, objects or spaces that signify the identity of the deceased like their bedroom or facebook/myspace page

All of these strongly enough is what an ex-lover does to get over the relationship. Especially idealizing the other person by reinterpreting negative qualities.

Patty Hearst - good example of stockholm syndrome