Ex already has a new girlfriend, did our relationship meant nothing to him?

If an ex has already moved on with someone else, only two months (maybe less) after breakup, does that mean he has never felt anything for me? How he already could go with someone now, when I was still thinking about him? Moreover I am surprised because the girl is not his type and she is nothing like me, and they went on a vacation (i is such a couple thing, weird to do that when you just started dating).
Thank you
Updates:
3 mo
Well I feel dumb now but I thought he was single since all this time..! And he was checking out other girls so I was just thinking maybe he tried to flirt with some girls (we are humans after all) but not dating..!
3 mo
Sorry for the update stupid move.
Ex already has a new girlfriend, did our relationship meant nothing to him?
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