Why does my ex want to compete with me in everything? Do you have any ex who is like this?

Anonymous
We broke up due to incompatibility and it was mutual. I'm 24 and he's 28. I live by my own and he lives with his parents. Both of us have cars and earn good money. For some unknown reasons, once in a while he will text and pretend to ask about my life. It's like he wants to know what's going on with me. He will ask something like "so how's your work and how much you make this year?" or "Are you planning to buy a house/new car?"

He also seems annoyed when he found that my new boyfriend is someone who can be considered as successful. Why would he sounds so competitive? Is he holding a grudge over me?
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*why does he sound so competitive
Why does my ex want to compete with me in everything? Do you have any ex who is like this?
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