Responses
The girl is not the love interest neither is involved in the love triangle. The three of them are CHF
Umm Tied up in Twins?
http://www.mangago.zone/read-manga/faded_first_love/
I think this one?
Any bl love triangles with a girl? I remember one like this, there was a girl and boy and the both of them thought they liked the same boy but it was a misunderstanding, so misunderstanding or no misunderstanding recommendations are fine.