DONT you think this is disrespectful?

So me 25 and my ex 23 are hanging out and acting like we've been.dating after 2 months of being broken up. . I know your asking "why are you hanging with your ex?" But we try to stay friends cuz I'm just a nice guy like that. Anyways her new sugar daddy 55 calls her and I asked politely if she wouldn't answer while I'm in the car and wait till I get out. Well she argues and answers. I told her after the phone that if she still wants to hang all I ask is that she doesn't bring him up or answer his calls in front of me. It's called respect! I would never call girls I'm hanging with in front of her. Anyways she got a Shitty attitude and so I told her that she can take that attitude some place else and she left. I guess that's why they say you can't b friends with your ex. Was I in the wrong for thinking that was disrespectful???