Pixies

https://www.mangago.me/read-manga/our_relationship_is/

https://www.mangago.me/read-manga/hate_girl/ (pretty new so you might want to let it marinate)

https://www.mangago.me/read-manga/but_please_help_me/ (a but different but still a good angst)

https://www.mangago.me/read-manga/july_found_by_chance/ (this is a slow burn angst but in a different way so I still wanted to recommend it)

https://www.mangago.me/read-manga/kakao_79/ (this was also isn’t exactly like that but one of the longest slowburn ive read)

https://www.mangago.me/read-manga/gradually_close_to_the_heart/ (this was a cute read)

https://www.mangago.me/read-manga/perfect_relationship/ (This one had a really interesting concept? it’s completed on a different website)

https://www.mangago.me/read-manga/my_husband_who_hates_me_has_lost_his_memories/ (havent got around to reading this yet but seems alright?)

https://www.mangago.me/read-manga/among_the_filth/ (havent finished but angsty also dont like the ml that much)

https://www.mangago.me/read-manga/there_were_times_when_i_wished_you_were_dead/ (now the ml in this was pretty hard to like ngl)

Ok wait i didn’t see the part where you said ml hated the fl, Ive seen other ones that might work better:

https://www.mangago.me/read-manga/i_thought_it_was_a_common_isekai_story/

https://www.mangago.me/read-manga/yearning_2l/

https://www.mangago.me/read-manga/what_it_means_to_be_you/