I don’t think this man wants his ex out of his life - it also sounds as though she is having trouble letting him go. She knows he’s in a relationship with you, but while you’re prepared to facilitate his relationship with her, it will carry on. He knew you weren’t happy about the one to one - which I have to say, sounds like a date - but he still went. That would be the final straw for me. If you don’t want a confrontation or to issue an ultimatum, at least step back a bit and concentrate on friends and family, and be generally more unavailable. His response will tell you all you need to know.
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Where did 'please' and 'thank you' go?
Does anybody work out with kettlebells ?