What is the main conflict in Aftern Twenty Years?

The main conflict is in the police officer.  He promised
to meet his old friend twenty years earlier, and he was there. It was a testament
to their friendship that both men were there.  But he realized when the man lit the
match that his old friend was a criminal who was wanted in Chicago. This is a man vs.
self conflict. He is a police officer.  Does he arrest his best friend, a man who was
like a brother to him in their youth?  Or does he let him go?  The man came 1000 miles
just to see him, and now he is going to arrest him?  He resolves the conflict by having
a plain clothes officer arrest him.  But he can't even face him after that. He writes
him a note.