If The Holy Spirit Nudges You To Keep Away From Someone, Listen. He Knows All And Trust Him. Do Not Think That The Enemy Will Not Try To Bring This Person Before You, He Will. Stand Firm And Trust Holy Spirit.

This is a very interesting subject. I have learned this lesson in reality far too many times that I care to admit. I am a trusting person and I have the heart of an evangelist. Couple those two qualities together and you will find that you reach out to all sorts of people. Salvation is a gift freely given to those that accept it and want to live in heaven for all of eternity.
There tends to be cases of meeting of people that you just want to win them over to the Lord. Trust Holy Spirit when He draws you to them and just as important when He draws you away from them. He will allow you to connect with attempts to share the gospel and your testimony with them. If there is no change in their heart to cause it to soften He will not (that is what I have found to be so) encourage you to continue. Especially  if they flaunt sin in front of you and they may even say one thing to you and then mock you as you walk away. Jesus does not put His people in situations in which they will become embarrassed or embarrassed by another.
Sometimes it is hard to not reach out to another when He pulls in the reigns and tells you no more communication, because you really do have a heart for people. He has placed that heart inside of you and that is not a bad thing. Think of the many numerous times when He did lead you to someone and they were very receptive to the gospel and even your testimony. I would venture to say they outweigh/out number the times of the opposite.
He knows in advance the plan of the enemy and He will even give you warning dreams to keep you on His path and not to fall for the tricks of the enemy. He loves you so very much that He will even give you that dream as a warning just before you awake for the day. Thank God that He does do that because it stirs so much in you that you will not want to go against the warning right?
When you receive this warning dream be prepared that the person will somehow come across your path. Be prepared and do not let your guard down OK. If He says don't speak then do not speak. No matter how many times they may try to strike up or initiate a conversation. Be polite and smile but keep on moving past them. It is better to obey God. If you can toughen up and follow through eventually they will get the hint and hopefully they will stop trying to communicate. If they are a strong willed person then they will try to pursue again just hold firm and trust God. He always makes a way out for you, TRUST.
When you stand firm He can then minister to you. I found that to be the case recently. I did not budge and a few minutes later I was blessed immensely. I happened to look down on the ground and saw a dime. I went to pick it up but before I did I asked Holy Spirit to cover it with the blood of Jesus as a protection. The moment I picked up that coin He spoke to my spirit. I instantly recalled the parable of the 10 virgins. It was a dime which is a ten cent piece and He then urged me to pray silently in the spirit for the 5 virgins that were not prepared for the bridegroom and were left out of the celebration. This parable is to cause one to prepare for Jesus' coming again to claim His people. Of the 10, 5 were prepared and ready when He came for them and 5 were not. Which group do you want to be in, the 5 prepared or the 5 unprepared? The choice is yours. Prepare for eternity for it is a very long time without end and do you really want to spend it in heaven of hell. I own a book by Mary K. Baxter and she writes about hell is real. I felt led to start reading it again and believe me you do not want to go to hell to experience what awaits you there. It will not be for just a day, week, month or even a year. It will be your final demise for all of eternity. I implore you to change your ways while there is still breath inside of you. Ask forgiveness and repent and ask Jesus into your heart. There is still time to do that and know that you will spend eternity in heaven.