I'm going to flirt with a girl in a relationship
Are you attracted to this girl?
I don't think so I have somebody in mind
You shouldn't flirt with someone who is already in a relationship. You should only flirt with single people.
Nah, I'm going to do it I'm bored
Being bored is not a good excuse to flirt with someone. You should just leave this girl alone and find one that is single.