More than a love triangle it’s like a trio with 2 boys and 1 girl but either way I recommend it
http://www.mangago.zone/read-manga/ichi_ni_no_san/
Maybe it's this one? The three are childhood friends if I happen to remember it correctly.
http://www.mangago.zone/read-manga/dasadanan/
Maybe this one.. Even if its not, give this Manhwa a try...The story is beautiful.
http://www.mangago.zone/read-manga/inner_beauty/?aBv7
Any love triangle with 2 boys and 1 girl and the boys at the end get together??