Understanding the type of guilt you are experiencing can inform you of whether or not to bare the guilt and move through the mourning process. If your guilt is not justified it can be helpful to identify this as neurotic guilt and realize it's self-serving nature and the unlikelihood of it leading to positive change.

Fairbairn, William Ronald Dodds (1952). Psychoanalytic Studies of the Personality. London: Routledge & Kegan Paul.

Kavaler-Adler S. From neurotic guilt to existential guilt as grief: the road to interiority, agency, and compassion through mourning. Part I. Am J Psychoanal. 2006 Sep;66(3):239-59. doi: 10.1007/s11231-006-9020-8. PMID: 16969702.