sl

Devils line
Reimei no arcana
Orange marmalade
Flawless

I just read this and this like really heartwarming but sad at the same time
https://www.mangago.zone/read-manga/will_you_marry_me_again_if_you_are_reborn/

Not too heavy, but FL is dealing with trauma/depression after escaping from her abusive father:
https://www.mangago.zone/read-manga/i_gave_birth_to_a_murderer_s_child/

FL remembers her past life where her and her entire family were executed for corruption. It was due to her lover, who worked undercover in their estate. Now he is the lord of their former territory, and both are dealing with trauma and guilt:
https://www.mangago.zone/read-manga/the_wolf_lord_s_lady/

Very heavy story and very long, but worth the read. Contains all of the things you mentioned:
https://www.mangago.zone/read-manga/mars_souryo_fuyumi/

Girl meets her old bully who has fallen in love with her at first sight. There's some trauma, revenge, remorse:
https://www.mangago.zone/read-manga/kimi_no_sei/

This one is DARK. Trauma, angst, pessimistic realism. But it was SO good.
https://www.mangago.zone/read-manga/sensei_no_shiroi_uso/