Angsty romance where the lead has a toxic relationship with their ex but meeting the MC makes them forget about them

Hi, everyone! I'm looking for recommendations for a specific trope. If you've read or watched Given, think about the whole Ugetsu × Aki × Haru thing:

Basically one of the leads has a toxic relationship with their ex. Even if they're not dating anymore, they keep on seeing each other and they can't move on (the ex generally is the colder one who acts like they don't really care about the other) UNTIL they meet the MC (or the main love interest) who they fall for and makes them forget about their ex. Of course, I don't expect a story with these type of characters to be fluffy and wholesome. I expect full angst and drama 😂

It can be a straight romance, or a BL or a GL. I also don't mind if it's a manhwa or manhua.

If you have any recommendations please let me know. Thank you 🫶🏼