I met this girl online that i’m trying to sleep with. I have a gf (save me the morality comments) but she won’t fuck me because she knows I have a gf.

What’s the advice on how to play it? Should I just tell her that we have broken up? But the she would want to come to my house or stay over or meet up outside which couldn’t happen so she would figure out I’m lying to her. What do I do?