OP...
Can you explain to me why you feel that YOU lost when:
Your ex girl cheated on you without your knowledge nor consent? Tell me what exactly what you lost because I don’t understand how anyone can lose something they never had, not to mention, lose something that is not worth keeping?
You ex girl being gay may be an extra blow to the ego, but regardless of whether she is a cobbler gobbler or not doesn’t make her anymore or less the POS that she is...
You did the right thing by deleting her number. I would have blocked it then blocked her from my thoughts. What she does after than, isn’t not your problem nor your concern. What goes around comes around. Justice will be served via the universe, so move on with your life and you will find someone worthy of your time, effort, etc..