I am in love with a man that has a girlfriend and him in love with me. We didn't plan to fall for each other?

Are you sure that he loves you like he says? He has a girlfriend, the one he probably truly loves. If he didn't, then he would have left her long ago! Just because he's a Christian, as he claims, it doesn't make him an Angel. I doubt that he would leave his girlfriend for you. He says there must be distance between the both of you, and yet, he calls you anyway. And since a relationship will never happen between the both of you, it is suggested that you tell him to stop calling you. He's playing with your emotions and that isn't fair to you. Your best bet would be to start moving on because he will never be yours. This is the reality of the whole thing. Go out there and socialize with your friends, and within good time, you will find the man of your dreams.