I am looking for any yaoi webtoon or manga involving a couple who break up but towards the end get back together ?similar to https://www.mangaupdates.com/series/y3k837p/i-m-here-to-take-revenge

I don't want to spoil it, so I'll just say that it doesn't quite match your requirements 🙄 Sorry!!
But i hope you will like it 😉
Hina wa Mitsuiro no Koi ni Torawareru

BL maniac - szukam maniaków BL! 🐅

Loss Time ni Hanamuke o is remarkable, very chill, mature and authentic emotions. It has stuck with me in my heart. I left a review you can see if you click over there; I'm sure I said it better then.

I'm hesitant to recommend because I dropped it with GREAT FURY at 100 chapters (out of 106) when the romance didn't go the way I wanted, but some people don't seem to mind, so...Love or Hate (Yeong Ha). The art is phenomenal and the writing is actually really good, until the part I hated.

I don't read love triangles anymore, for my health.

BL fiend | tag gremlin | metadata yum

Emotionally these two are a rough ride. You can just read the 2nd one if all you want is the reunion.
Kyuuso wa Cheese no Yume o Miru
Sojou no Koi wa Nido Haneru

I'm very hesitant to suggest this one. The story is DARK and not for the faint of heart in any way. That being said it does match your criterion. Proceed at your own risk Dark Heaven

Life Senjou no Bokura

I haven’t read the one you listed but this story had them breakup and get back together. Must warn you this manga is my treasure because it made me cry my eyes out.