PBA, if you choose to think the worst about someone you automatically will. If you choose to dan l’kaf zchus you will as well. The glass is either half full or half empty depending on the way you choose to look at it. If you want to throw the kid out and are looking to make trouble for him, you will see things the way YOU do. If you know the kid as the OP described a “good boy” who never got into trouble all the years then you would choose as I do to dan l’kaf zchus. It is as simple as that.
Why would you even think something wrong about a good kid. Why would anyone “always choose” to think badly about kids in general. As my friend used to say “G-d don’t make no junk!”. Stop forcing these kids into the molds you expect them to be. Again, he didn’t rob anyone, he didn’t drug anyone, he didn’t hold anyone up, shoot anyone, hurt anyone, etc. Stop making the kid out to be a hoodlum or a villain which he is not.
Why not cut out his tongue while your at it or poke out his eyes? Would that be enough punishment for you for such a terrible aveirah? Please show me in the Torah where these consequences exist for speaking to the other gender. Enough is enough already. Let these kids breathe and live a frum life! Stop cutting them off at the knees and throwing them out like smelly garbage. You would think they suddenly developed tzoras and had to be banished from the land.