This study re-examined the role of romantic relationship characteristics in unwanted pursuit behavior (UPB) perpetration. Relationship characteristics were investigated accounting for the role of significant breakup characteristics, using data of 396 legally divorced adults and advanced count regressions. Except conflict, the main effects of characteristics of the former relationship didn't contribute explained variance to the frequency of UPBs when controlling for the effects of significant breakup characteristics (initiator status and post-breakup negative affect). However, moderator analyses--investigating the interactions between relationship and breakup characteristics--did reveal significant effects of relationship satisfaction, alternatives, investments, and anxious attachment in interaction with initiator status and of relationship alternatives in interaction with post-breakup negative affect. These findings illustrate that the association between relationship characteristics and UPB perpetration is more complex than previously thought and are theoretically and clinically valuable. This resulted from the conceptualization of most stalking as a form of unwanted relationship pursuit as well as observations that stalking most often occurs between people with a shared relationship history (Spitzberg & Cupach, 2003). Cupach and Spitzberg (1998) elaborated on unwanted pursuit, which they named obsessive relational intrusion (ORI) and defined as "repeated and unwanted pursuit and invasion of one's sense of physical or symbolic privacy by another person, either stranger or acquaintance, who desires and/or presumes an intimate relationship" (pp. 234-235). Other researchers similarly developed constructs to describe these relational intrusions; for example, UPB (Langhinrichsen-Rohling et al., 2000), breakup persistence (Williams & Frieze, 2005), and intrusive contact (Haugaard & Seri, 2003).According to recent meta-analyses (Cupach & Spitzberg, 2004; Spitzberg & Cupach, 2007), the diversity of pursuit tactics can be classified into several categories. These cover a broad continuum of activities, starting from relatively mild behaviors and escalating in terms of severity, frequency, duration, and impact (e.g., Langhinrichsen-Rohling et al., 2000). By most judicial definitions, stalking occurs at the point when UPBs develop into an intentional pattern of repeated behaviors that result in fear or threat. Further, whereas UPBs exclusively result from a desire for intimacy with someone who is reluctant to engage romantically with the pursuer, stalking can also evolve from other motives such as hatred or revenge (Cupach & Spitzberg, 1998, 2004 Spitzberg & Cupach, 2007).Former partners have often been targeted in stalking and UPB studies because they represent the largest group of stalkers and pursuers (about 50%; for reviews, see Douglas & Dutton, 2001; Spitzberg & Cupach, 2007) and hold a higher risk for violent, persistent, and Post-Breakup Unwanted Pursuit 4 recurrent stalking behavior (for a review, s...