What should I do to get back with my ex?

My ex and I dated for 1.5 years and we have broke up for a good 6 months now. He is dating someone else now for 4 months. He said that we should remain as best friend. At times, when his girlfriend is cold to him, he would tend to give me more attention. But when his girlfriend starts to entertain him, he would kinda throw me to oneside. (That is what I think) He said that if I were to have more faith and trust in him we would not have broken up. But it was not easy, he was always surrounded by girls. All his friends are mostly, but now I know them all because we go to the same church. As of now, I have been trying my best to get him back. When he is down I would make my way down to comfort him, or when he is alone I would try to accompany him. Am I being too nice/friendly? What should I do to get out of this friend zone?
What should I do to get back with my ex?
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