Why is my boyfriends ex messaging me on Facebook and saying she is surprised on how many nice places he’s taken me to and about my age?

She is saying that she is surprised he’s taken me to so many nice, expensive restaurants/places so early on. One he spent $400 on the dinner.
also she’s 35 and I’m 26. He’s 39. I don't know if there’s jealousy but it’s off putting. He broke up with her a month before he met me.

Why is my boyfriends ex messaging me on Facebook and saying she is surprised on how many nice places he’s taken me to and about my age?
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