What if I meet up with another guy from craigslist?
Is it a guy you're interested in?
Yes, he's much more fit than my boyfriend
It's bad to have a random hookup with a stranger especially if you have a boyfriend. If your boyfriend finds out he would be hurt.
What, so I can't talk about my hookup?
If you do this you will have to keep a secret and when he eventually finds out you will loose your relationship. It is best to be faithful when you have a so.