Assalamu alaikum wa rahmatulahi wa barakatuh brother,
If the sister you are talking about here really is married already, then please stay away from her for the sake of not falling into sin yourself, as well as not being the path for her to fall into sin also.
Even staying in touch with her without any ill intentions at this point can easily lead you to commit sin and this is why it is recommended to stay away, even if it is only via messaging, the result can still lead to the same. Cutting contact with her as soon as possible is the best way to prevent feelings between you getting any stronger.
Try and put yourself in the shoes of her husband. If he should find out then it could potentially destroy their marriage. It will cause issues with trust and is disrespectful of her to be doing these things behind his back. Imagine how you would feel if you were married and your wife did the same to you. How would you feel?
It may be difficult to walk away now that you have developed such strong feelings for her, but there are other ways to find love in the correct way that will not lead to sin. If you are looking for marriage then ask around your friends and family if they know if any sisters looking for marriage and arrange some meetings. You may not feel motivated to do this at this point, feeling that you could never meet a woman you love as much as this one, but in time, as you meet others, you will come to realize that there are other women out there who you could live happily with.
To make this easier for you, remember Allah as much as possible and fear Him. Remembering that what you are doing with her is sinful will provide you with some motivation to cut ties and seek marriage to someone else via permissible means due to the fear of Allah that you carry in your heart. To do this, try and remember Allah in all that you do so that he is always in mind. Spend more times in acts of worship, especially fasting that serves as an excellent means to control one’s desires.
May Allah guide you in the straight path and grant you a righteous spouse who will be the coolness of your eyes in this life and the next.
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