Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
No doubt that you have committed many acts that goes against the Shariah rulings. These acts include your having a relationship with a woman who is alien to you and your exchanging love expressions with her, all of which are forbidden as any relation between a man and an alien woman outside wedlock is unlawful.
So, dear brother, may Allah protect you; hasten to repent from these sins, and thank your Lord for having saved you from marrying such a woman who seems to be a non-religious one. Limit yourself to your wife whom Allah has made lawful to you. We hope your wife is pious and of good character. As the pious woman is the only one who can be entrusted with honour and money. This is why the Prophet (Sallallahu Alaihi wa Sallam) urged young men to seek pious women if they want to be successful. [Reported by Al-Bukhari]
Finally, we would like to advise you of some steps that would help you interrupt your relation with this lady.
1. Convince yourself of the impossibility of marriage to this lady. When you despair of this marriage you will give it up.
2. Remind yourself of her shortcomings.
3. Remind yourself of the danger of the sins you commit because of her love.
But more importantly take refuge with Allah. Ask Him to make you forget her love and forget being linked to her in any way.
Allah knows best.