As written in his book
St. Mary in the Orthodox Concept, Fr. Tadros Y. Malaty clarifies that the virginity of the Theotokos is not a matter of her personal life, but rather in conformity with the prophetic sayings of the Old Testament, such as Isaiah and the portion of Ezekiel about the gate that the Lord entered that shall remain closed to all. This is the view of the Orthodox Church, and is reflected in our hymns and praises from all traditions since time immemorial. It was affirmed before even the councils, such as in the Creed of St. Hippolytus (c.215 AD), which made belief in the birth of our Lord Jesus Christ to the Virgin Mary a required tenet of Christian belief with the question “Do you believe in Christ Jesus, the Son of God, who was born of the Holy Spirit and of the Virgin Mary?” It is also attested to as the universal belief of the Orthodox Church in other early writings, such as those of St. Ignatius of Antioch, St. Ephrem the Syrian, and St. Basil. Put simply, the belief that the Theotokos was not always virgin was not acceptable to the apostolic church, and continues to not be acceptable to the apostolic church, and will always be not acceptable to the apostolic church, regardless of which particular communion you think fits that description. That should tell you something, seeing how many other things Catholic, Orthodox, and traditionalist Protestants argue about regarding the history and belief of the Church.
Again, it is really missing much of the significance of St. Mary’s virginity to only look at things in light of the use of one word in an English translation of the New Testament, since (at least for Orthodox) it is really connected to so many of the prophetic settings and symbology found in the OT that speaks of the coming of our Lord and Savior Jesus Christ. See, for instance, this Coptic hymn that makes clear the connection between the patriarch Moses and the Theotokos and the virginal birth of Jesus Christ:
“The burning bush” (sung in English, with English subtitles for some reason)