Those 2?

Ok- I messed up- It's not a high school romance- it's a college romance.
Basically: One day, there's a teenage boy, Adam, who's moving out of the city to live in a nice small town. As his father wants to be closer to his husband.
It's Adam's first day and he introduces himself and like every girl and/or guy, they start to swoon over him.
A girl, named Abigail, comes up to him and asks to be friends. Adam agrees and they talked, afterschool, Adam was driving home and when he got out of his car someone shouted his name. He turned to see it was his childhood friends, Keith and Alex. Then another person came, a guy Adam was not familiar with but something about him caught his attention.

After some time, Adam later then knows that the guy is actually named Hiro and he was Abigail's boyfriend.
Abigail invited Adam to shop with her and Hiro, and they both have a blast.
After a few months, Adam has developed feelings for Hiro and tries not to show them as Hiro already was taken and he doesn't want to get in the way of that. One day, Adam had an incoming call from Hiro, as he picked it up, Hiro was crying. Adam went to his house and he finds out that Abigail had just cheated on him.

After finding this out, what would you do if you were Adam? Be mad at Abigail causing a whole commotion only to leave Hiro nervous? Or leave Abigail alone and try to comfort Hiro but risking your feelings for it all?