Help! What can I do to make him interested again?

There was this guy who was in love with me but I had a boyfriend. I liked him back but I wanted to remain faithful to my ex. He was waiting for me for almost 2 years, but when I broke up with my ex, there was another guy who also liked me (but I didn't ) who I recently found out that he lied to that guy whom I liked back, by telling him that he had started dating me... That made him stop acting interested, believing that I didn't want him, and he has started dating another woman. I am confused and sad, because I wanted to be with him so much (I just didn't want to be unfaithful to my previous partner)

Help! What can I do to make him interested again?
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