She told me we should stop having sex until i married her
"I'm in a relationship with a lady that i stay with and she come to a point where she told me we should stop having sex until i married her, so i didn't push her out as i want her in my life, so we were doing sin all along as we're not marrying each other? and did God approve this relationship?"
The Bible sets standards for those who follow Jesus.
Gen 2:18 And the LORD God said, It is not good that the man should be alone; I will make him an help meet for him.
Gen 1:27-28 So God created man in his own image, in the image of God created he him; male and female created he them. And God blessed them, and God said unto them, Be fruitful, and multiply,
Heb 13:4 Let marriage be kept honorable in every way, and the marriage bed undefiled. For God will judge those who commit sexual sins, especially those who commit adultery.
Your lady is right in saying that you need to commit to marriage, which means only one woman, not others. This will protect you from sexual diseases that are common when you have sex with other women, and will protect your lady from acquiring sexual disease as well.
God's purpose is to build a One-man and One-woman marriage for your happiness and well being. That is the teaching of Jesus in the Bible. God appoves of marriage, and does not approve of sex outside of marriage.
It is the joy of husband and wife to have sex and intimacy and to trust each other and care for each other.