Why Is My Ex Boyfriend Picking Fights?

glowgirl3
My ex broke up with me almost three years ago. He wanted to stay friends (which initially I said no but after about nine months I was cool with it). Recently, it seems like every time we talk it turns into some type of debate. He gets mad at me if someone tells me something before he tells me or stupid stuff like that. I don't want to be with him anymore and I really do want to be his friend. We don't talk a whole lot and when we do I would like it not to end in a debate. What's his deal?
Why Is My Ex Boyfriend Picking Fights?
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