Went out with a coworker and she kind of hooked me up with a friend of hers few weeks ago. We've been talking for a while, have been out and more.
Just found out today from another coworker that the friend actually is in relationship and lives with her boyfriend. I don't think coworker #2 knew I didn't know

Now the friend is still texting me. In any other situation I would just ignore her but she is friends with someone I work with every day.
Of course the coworker who i have to thank for this situation is the same bitch that gave me Artisanal soap as a gift few months back. Figures.
How do I completely cut ties with the friend and not blow up ties in the work environment. Coworker is not a superior or anything but she is also not exactly the type to act totally professional over this.
Like if they could all just go away and not effect my professional life that would be great.