Acknowledgments

The Link Between Singlehood and Mental Health from the Perspective of Moderation and Mediation of Selected Psychological Factors," has enabled me to conduct a mixedmethods research design.This research includes a three-wave longitudinal quantitative study, which was preceded by qualitative interviews.The primary objective of this research was to investigate singlehood and its associated mental health outcomes through the framework of ambiguous loss theory.Notably, the grant also enabled the publication of my current book in an open-access format, thereby ensuring its availability to a broader audience.The SONATA BIS 9 project has provided remarkable opportunities for my professional development within the field of research.Without this grant, I would not have attained my current position within the scientific community.It has allowed me to realize my ambition of establishing a laboratory dedicated to the study of singlehood.