Why do exes get mad when the guy takes his new girl he’s interested in to nicer, more expensive places?

Anonymous

His ex said this to me after me and him started dating and she then said she’s shocked he took me to such nice restaurants (she thinks he did all of this just to “hook up with” me).
“…he may have really liked you when he met you.. honestly I am shocked he took you to several nice places so early on (not his M-O)…so I think he just got out of control.”

Why do exes get mad when the guy takes his new girl he’s interested in to nicer, more expensive places?
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