Was Mary a LIFELONG Virgin?

This is a CLIP from URfriendlyhood's Channel. SUB TO HIS CHANNEL: https://www.youtube.com/@urfriendlyhood
The Catholic and Orthodox Churches believe, like all Christian Traditions, that Mary was a virgin when she gave birth to Jesus. But, unlike the other Traditions, they believe that Mary remained a virgin until the day she died. Where did this belief come from?
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