Kanojo wa Rabudooru ni Niteiru

[MangaDex]

 

[commonpoopmaster]

The ending felt incomplete though probably on purpose, either she passed on, left to start a new life completely, or possibly continue dating mc in the future after some time off, its up to the readers to imagine the ending they'd feel satisfied with.
Pretty good read

 

[Apposoz]

It's like the author is telling us to deal with it, like life. Sometimes, there is no closure.