Put it this way "why would you let a woman stop you from your regular Sunday night out, enjoying your drink and having a laugh?". Once you figure out the answer, you will be cursing yourself. If she comes out with the bf, so fooking what. You should never give her the satisfaction of knowing your are remotely bothered (even if you are). Just enjoy yourself and ignore her and just exchange pleasantries with the bf. He has got nothing to do with how shes been treating you. From experience, the more you ignore her, the more she feels bad about what she has done.

Go out and find other birds! Once you start going on dates with different girls or dating someone, your ex will get jealous but please dont do what she has done to you and go back to her and lied to whoever you with..!