Any bl where seme has an ex lover that he couldnt let go of or he wasnt able to move one f...

Top of my head, this is the only thing I can think of

https://www.mangago.zone/read-manga/sparkling_baby/

Here you go, but some of these hurt bad so be warned!
https://www.mangago.zone/read-manga/over_heat_1/

https://www.mangago.zone/read-manga/love_bite_lamyo/

https://www.mangago.zone/read-manga/bad_position/

https://www.mangago.zone/read-manga/bound_to_be_fools/

https://www.mangago.zone/read-manga/my_hyung_s_sunbae/

https://www.mangago.zone/read-manga/ways_of_parting/

https://www.mangago.zone/read-manga/enthusiasm/

https://www.mangago.zone/read-manga/a_link_between_relationships/

https://www.mangago.zone/read-manga/the_kang_s_yeesu/

https://www.mangago.zone/read-manga/wet_sand/

https://www.mangago.zone/read-manga/into_the_rose_garden/

https://www.mangago.zone/read-manga/art_buddy/

https://www.mangago.zone/read-manga/passion_1/

https://www.mangago.zone/read-manga/sugar_rain/

https://www.mangago.zone/read-manga/never_good_enough/

https://www.mangago.zone/read-manga/winter_that_year/

https://www.mangago.zone/read-manga/my_hyung_s_lover/

https://www.mangago.zone/read-manga/xx_partner/

Thanks

Thank you so much

You’re welcome! ヾ(❀╹◡╹)ﾉ~
Also, I suggest reading Ways of Parting first off. It’s amazing

Sure!!!!

Try Ogeretsu Tanaka's Monster series. Both guys in the relationship struggle to move on with their new partners for different reasons. It's really good. Here was someone's rec for how to read it chronologically:
0. Aazami - past Yumi x Kan
1. Sabita Yoru Demo Koi Wa Sasayaku -Yumi meets Mayama and breaks up with Kan chan
2. Renai-rubi no Tadashii Furikata (ch3.1 - 3.5) - Kan meets Shuuna and turns uke
- Narrow (Place collection) - dj Kan x Shuuna smutty sidestory
3. Hadakeru Kaibutsu - continuation Kan x Shuuna (Shuuna's POV as far, timeline parallel to no.2 for ch1

Thank you so much (づ￣ ³￣)づ

Omg! I just binge read this. This is exactly what I was looking for. I love the angst and the chasing. Thank you so much for recommending. I love this so much