Why is it important that you all believe Mary was ever virgin?
Because it is true, and we retain the knowledge of the truth.
Also, why did she even get married,I mean did she not know what happens when people get married.
She knew…see below.
I guess her husband remained a virgin the rest of his life also.
No, Joseph was most likely a widower who agreed to take Mary into his home for her protection. He remained
celibate for the rest of his life.
Mary’s Vow of Perpetual Virginity in Light of Numbers 30
Many people question whether Mary remained a virgin all of her life, and they dispute the idea that Mary had taken a vow of consecration to God. However, the Law of Moses contained specific instructions for both men and women who had made vows to the Lord. Let’s take a look:
Numbers 30:1-16
1 Moses said to the heads of the tribes of Israel: "This is what the LORD commands:
2 When a man makes a vow to the LORD or takes an oath to obligate himself by a pledge, he must not break his word but must do everything he said.
3 "When a young woman still living in her father’s house makes a vow to the LORD or obligates herself by a pledge
4 and her father hears about her vow or pledge but says nothing to her, then all her vows and every pledge by which she obligated herself will stand.
5 But if her father forbids her when he hears about it, none of her vows or the pledges by which she obligated herself will stand; the LORD will release her because her father has forbidden her.
6 "If she marries after she makes a vow or after her lips utter a rash promise by which she obligates herself
7 and her husband hears about it but says nothing to her, then her vows or the pledges by which she obligated herself will stand.
8 But if her husband forbids her when he hears about it, he nullifies the vow that obligates her or the rash promise by which she obligates herself, and the LORD will release her.
9 "Any vow or obligation taken by a widow or divorced woman will be binding on her.
10 “If a woman living with her husband makes a vow or obligates herself by a pledge under oath
11 and her husband hears about it but says nothing to her and does not forbid her, then all her vows or the pledges by which she obligated herself will stand.
12 But if her husband nullifies them when he hears about them, then none of the vows or pledges that came from her lips will stand. Her husband has nullified them, and the LORD will release her.
13 Her husband may confirm or nullify any vow she makes or any sworn pledge to deny herself.
14 But if her husband says nothing to her about it from day to day, then he confirms all her vows or the pledges binding on her. He confirms them by saying nothing to her when he hears about them.
15 If, however, he nullifies them some time after he hears about them, then he is responsible for her guilt.”
16 These are the regulations the LORD gave Moses concerning relationships between a man and his wife, and between a father and his young daughter still living in his house.
From this passage, we can see that the Law of Moses contained instructions for determining which vows were to be honored and which could be nullified by the parents or husband of a woman. While this passage does not provide any evidence that Mary had taken a vow of chastity, it does demonstrate that vows to God did occur in ancient Jewish society and that they were to be taken very seriously.
Concerning the Annunciation, we read the following exchange between the angel Gabriel and Mary:
Luke 1:31-34
31You will be with child and give birth to a son, and you are to give him the name Jesus.
32He will be great and will be called the Son of the Most High. The Lord God will give him the throne of his father David,
33and he will reign over the house of Jacob forever; his kingdom will never end."
34"How will this be," Mary asked the angel, “since I am a virgin?”
At the time of this conversation, Mary was betrothed to Joseph. Under Jewish law, they were already married but not yet living under one roof. If she had taken no vow of perpetual virginity, she would soon be engaging in normal marital relations with the likelihood of conception in the very near future. In this case, her question, “How will this be since I am a virgin?” makes no sense. If her virginity was only temporary, she knew that pregnancy would occur naturally soon enough.
On the other hand, if Mary had made a vow of perpetual virginity to the Lord, then her question makes much more sense. “How will this be since I am a virgin?” indicates that Mary questioned how this conception could occur since she had no plans to engage in marital relations because she was a virgin – a consecrated virgin by means of a vow before the Lord. Since Mary obviously understood how babies are made, she asked the angel how she could conceive without violating her oath to God. The angel responded that she would be overshadowed by the power of the Most High.
In preparing for the Incarnation, God performed two miracles: He preserved the young virgin’s womb during conception, and He opened the barren womb of the older woman, Elizabeth. “For nothing is impossible with God.” (Luke 1:37)