Sorry that was the wrong link.
https://www.mangago.zone/read-manga/cocoon_of_the_heart/
https://www.mangago.zone/read-manga/death_delayed_for_a_short_time_because_of_the_will/
https://www.novelupdates.com/series/the-regressors-personality-training/ (novel only)
https://www.mangago.zone/read-manga/i_m_a_villainess_can_i_die/
https://www.mangago.zone/read-manga/kill_the_villainess/ (spoiler: he loves her so much that he actually helps her commit suicide)
https://www.mangago.zone/read-manga/a_married_man/ (mostly towards the end)
https://www.mangago.zone/read-manga/greeting_you_strangely/
thank you everyone
anyone else got any suicidal MCs and their love interest desperately trying to save them