Any advice that you have for me?

So I have this best friend named Nicole and she has this boyfriend named Stephan. They`re like really sweet to each other and stuff. The thing is Stephan is such a jerk to me. He always ignores me. I even tried adding him on Facebook and he declined it because he said we`re not close friends. One time when I saw him walking, I said hi and he just said f*ck off. I just don`t get how can be the sweetest guy ever to Nicole but then the meanest jerk ever to me. I tried talking to Stephan`s best friend and he just told me that Stephan can be a little mean to people sometimes. And the reason why he`s suddenly the nicest guy to Nicole is because he`s in love with her. To be honest I just want to be treated the way that he treats my best friend. I don`t want him to be a jerk to me. I want him to be sweet to me to. Please help me. I need advice.