Dear sister Sadie, in our church we had one such sister who was doing the same thing, she came to our pastor to inquire if this was ok? She also believed she could change him. Our pastor took her to the back of our church where the children played, there was swings, and a large hill, the pastor said stand at the top of the hill please, she did, the pastor got within arm's length of her and said now pull me up to where you are, she pulled and pulled yet she was unable to pull our pastor up to the top of the hill, now he said give me your hand, with a light tug he pulled her down where he was at.
My dear sister he said, it is more likely he will pull you down then you are being able to bring him to the Lord. then gave her the following scripture to read (2 Cor 6:14-16) She listened and within 2 weeks she met a believer and 5 months later they married, she was so thankful to our pastor for Holy Ghost advice!
She and her husband are doing very well. This dear sister I know is hard!! I just thought and felt led by the Lord to share this with you. I shall not judge whatever choice you make, however I did wish to share this thought with you. May EVERY blessing always find you and find you most well through our Lord Jesus!!