I am sikandar bux I work in hospitality industry,and recently I have a she friend who says that she had converted to islam and I was so happy and I give her the knowledge of islam always but sometime I think she will quit islam not what happen and we are Facebook friend and I think I am attracted toward her because of her goodness not I want to delete her because I am attracted towards her and I am a married man if I propose her may she will accept to make relation with me but I don't want to cheat my wife and if I delete her from my Facebook account may be I cannot give her dawah and may be she can go astray... I should keep her my friend or don't make her my friend... please give solution to my problem

I understand that you want to tell this woman about Islam but you don't want to stray away from your wife. Most men act and then think later- so I'll give you a 'high five' on this one.
Have you ever suggested that your friend speak with someone else about Islam, maybe your wife would like to help or maybe you have another muslim friend you can introduce her to (a more single muslim friend). This way you can dawah and be loyal to your wife. As far as being around this person I suggest you speak with her about how you feel about your wife and explain that your relationship must remain just friends. If she's a person with any sort of morals she'll understand.

Personally, in the end either way, I'd say loyalty to your wife is more important.