My friend's boyfriend has cheated with me but I really don't feel bad about it... is this bad?

We're all in our last year of HS and this has been going on for 3 months I guess. She's only a friend (for a short time) but not a close friend you know for years.

He worries about getting caught and has expressed guilt. Well to be honest, I actually don't feel that bad about it. I'm kind of detached towards some people, not all but some I don't really care too much about. Is this bad?

Updates
+1 y
I just feel indifferent towards what we've been doing. He feels bad and guilt over it but I really don't.
My friend's boyfriend has cheated with me but I really don't feel bad about it... is this bad?
Post Opinion