DEDICATIONThis dissertation is dedicated to my father, Mr. Clifford E. Shamblen who has taught me not to be afraid of aspiration.iv ACKNOWLEDGEMENTS I would like to thank my primary advisor, Dr. Michael Cunningham, for his guidance and patience throughout the dissertation process. More importantly, I would like to thank him for all that he has taught during my tenure as a graduate student. I would also like thank my other dissertation committee members, Drs. Anita Barbee, James Beggan, John Birkimer, and Stan Murrell for their helpful comments and continued commitment to seeing me through the dissertation process between my proposal oral nearly 3 ½ years ago and the present time.I would like to thank my wife, Jackie, for seeing me through this journey, which, of-course, has its' ups and downs. I thank her for the support, love, and encouragement that she gave to me during the many nights I spent on the computer late into the night. We are more likely to "hurt the one's we love" than we are complete strangers (cf. R. Miller, 1991Miller, , 1997. Early in dating relationships, partners appear to me more likely to manage their impressions to present themselves as better than they really are (romantic inflation), and later in relationships, partners may behave in a manner that is worse than their typical behavior (post romanticism). The social allergy and social enrichment constructs are relevant to these phenomena, as these typologies focus on partner behaviors that are rather minor in their impact on an individual's affect to behaviors that have a major impact on an individual's affect. Negative non-intentional negative behaviors are presumed to be related to negative sex-role stereotypes, with men engaging in more and increasing their frequency of bad habits and women engaging in more and increasing their frequency of inconsiderate behaviors. Changes in these behaviors are also presumed to be related to changes in relationship outcomes according to the investment model.Two preliminary studies were conducted to examine stereotypes about changes over the first year of dating relationships using a sample of 161 undergraduates (study 1) and to examine the relationship between partner behaviors and individual satisfaction using a cross-sectional sample of 124 couples dating an average of 5.25 months (study 2). Study three examined investment model predictions, as well as examining possible explanations for why partners may increase vi their frequency of negative behaviors and decrease their frequency of positive behaviors. A longitudinal sample of 70 couples dating an average of 13.53 months was followed for two months to examine these questions.The present series of studies suggest that it is largely negative relationship behaviors that increase in frequency over the course of time in dating relationships. Consistent evidence was found for gender differences in behavior corresponding to negative sex-role stereotypes, with men being seen as engaging in more bad habit behaviors and women being seen as engaging in more...