Am I in the wrong, or my ex?

The other day my ex asked me if I could drive him to McDonalds, catch up because we handn't spoken in a while. I've been with my boyfriend for nearly a year and would completely hate the idea of him going out with his ex so I said no I wouldn't want to do that to him, because of the principle of it (and I had no intention of going anyway I wouldn't want to do anything less tbh) I'm completely happy in my relationship, I'm in love with him, therefore I value and respect basic social expectations? Which is why I said no. And he flipped out at me, saying things like: "I wouldn't expect you to be controlled by a boy" "You're obviously both insecure" And finally saying that he thinks we have an "insecure relationship" That completely angered me because I don't think he has a right to say that at all. I felt it was just unacceptable to say that to someone in a relationship, surely anyone would be angered if someone said that, but he said he can have opinions? I just wanted to back up my relationship because I got so protective of it when he said that. Anyone that is in a relationship (or isn't), what are your opinions, do you agree that he's in the wrong, or is it a normal situation to go out with exes? Is it acceptable to tell me he thinks I gave an unstable relationship, because he can have opinions or is it unacceptable?

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