وَلَا تُطِعْ كُلَّ حَلَّافٍۢ مَّهِينٍ ﴿١٠﴾
Neither obey thou each feeble oath-monger,
Is carrying tales between people (namimah) haram?
Haram Speech & character Quran · 2
Short answer
Yes. Carrying words between people to cause trouble is namimah, and the Quran blames the one who goes about with malicious gossip (68:10-11). A Muslim should help settle disputes and keep what is private.
Evidence
Quran
هَمَّازٍۢ مَّشَّآءٍۭ بِنَمِيمٍۢ ﴿١١﴾
Detracter, spreader abroad of slanders,
This is general information, not a fatwa. For your own situation, ask a qualified scholar.