Okay so two man were lovers since high school for 10 years or something like that but they’re fighting right now and a stranger younger boy falls in love with the uke and the uke is slowly falling to. But there are problems with the old seme boyfriend... well in the end the younger seme and the uke gets together and after there’s a story about the ex-boyfriend getting together with a new guy(actually an old friend who always was in love with the seme but never told because the relationship he had with the uke)
Plss someone help me find it Thank you!

It sounds a bit like - Sore wa Himitsu desu but I honestly doubt this is what you're talking about.

Yea well i know that one but unfortunately it’s not the one I’m looking for

Jounetsu no Young Man by Takahashi Yuu matches your description, so far (but specific details of how the two main characters get together might change that).