Responses
ff
https://www.mangago.zone/read-manga/exotic_love/
The mc is the one who regretted it but it's so good, you should definitely give it a try!
Abusive ex:
https://www.mangago.zone/read-manga/doronuma/
https://www.mangago.zone/read-manga/collar_kiss/
bls where seme is mean/cold and regrets it? or it can be where mc leaves their ex/2nd ml that treated them bad and ml treats them better