Why is my ex-bf dating a girl older than me now?

He broke up with me after over a year and now he's dating a woman 6 years older than him. Why would he want someone older than him? I asked him and he said just me asking the question demonstrates my immaturity, that she's not so much older. You cannot tell she's older by her looks but she must want kids soon. Why would he choose her over me? He claims it wasn't a choice between us, that we ended and then he chose to date her but if he can have someone younger than him that still wants him, why go for someone 6 years older?

Why is my ex-bf dating a girl older than me now?
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