
Biting the Tiger
https://www.mangago.zone/read-manga/biting_the_tiger/
Keeper of the Pearl
https://www.mangago.zone/read-manga/keeper_of_the_pearl/

this one's kinda really tragic https://www.mangago.zone/read-manga/the_broken_ring_this_marriage_will_fail_anyway/

umm kinda? if you want to be spoiled i'll let you know what happens but if you don't want to be spoiled i'll just say that ML is the most dedicated, pining, and loving man ever. he made some bad choices in the past and he spends every day agonizing over it. i said it was tragic because the story is really sad. our mc goes through a lot (especially in her past lives).
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spoilers
in this life, where the story starts off, our reincarnated mc (ines) 'chooses' the ml (carcel) at a young age to avoid a bad end/relationship she experienced in another life. she does this because he's known as a playboy and therefore she thinks he won't interfere when she wants to divorce later. she doesn't know he's always loved her (in every single life, even if they weren't a couple). in this life, he kinda becomes a playboy to get mc's attention and regrets this so much to the point of death later lmao
ines has also been in relationships with others in past lives. it's kinda messy but i would NOT let this put you off from reading it. this story is so complex and sad but so fantastic. their relationship is truly the sweetest thing ever but i rly need u to trust me on this one

"Novae" in webtoon, (it's a historical romance with a touch magic and a dash of astronomy. It chronicles the adventures of Sulvain, a sweet tempered necromancer and Raziol, a passionate 17th century astronomer. A connection forms between them and their relationship blooms, however when the body of a fellow astronomer is found on the steps of the Academy of Sciences, their lives are entangled in ways they could never foresee.) they first meet during this timeline , currently they meet again after many century in the 70s
Recc Stories with multiple lives/timelines and the couple always end up together and are so into each other