If a boy have a relationship with gay is the boy gay also?

When a boy has a relation ship with an other boy this doesn't mean he is gay.
Even when the other boy is gay.

You are gay when you FEEL something for an other boy, when you're ATTRACTED to that boy.

This is when you know you are gay.

You also don't need to be gay to have sex with someone from the same sex. But when you feel sexually attracted to the same sex you're definitely gay.