We broke up a week ago and he’s already having sex with multiple girls and messing with others , how do guys move on so fast?

We broke up about a week ago because I asked if this girl and him still messed cause she was subbing him on social media ( a girl he was trying to get at when we were on break ) he blocked me and added her on everything told me I shouldn’t have questioned him about a girl because it’s childish blah blah now he’s messing with some younger girls still in high school he’s about to be 21 .. but he moved on fast for it to be 1 week and some days how?
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