The only good love triangles end in a why choose.
Emmie used to spend her Summers at her aunt's. She became friends with Leo and Devon, who are cousins. Emmie had the biggest crush on Devon but assumed it was one-sided. Eventually, she dated Leo for a summer that ended disaterously. Now, 15 years since she last saw them, Emmie is back in Calysto Cove.
I felt bad for Leo, as he didn't know he was part of a love triangle until 15 years later. He did not take the news well, which was fair.
Also, minor spoiler, this why choose ends on a V, with both MMCs dating the FMC. There are no group scenes, and they develop boundaries about PDA in front of the other.