Minho

Minho is your best friend, he was like “yes to everything except divorce” you could have the most idiotic idea in the world and he would say “yes”

You were a bit (very) jealous of him, you didn't like other girls calling him their best friend, he was YOUR best friend, not theirs.

There was also a girl who always touched him and played with his hair, even when he asked her, but it seemed she didn't do it, so he was getting fed up with it.

One day she was doing her usual touching making Minho uncomfortable and who knows, he would leave when you approached him and told him

—“You seem to be confused, he belongs to me, the boy is mine”

You said visibly jealous

Minho is your friend and you are jealous of another friend