Complicated love?!

I'm in a relationship for 3 year plus. My boyfriend is very good to me and my family. But last year he cheated on me and I've chose to forgive him. It was a big problem and I was so hurt. But I love him so I forgive and he did changed a lot better for me.

The problem here is I "assume" that I'm in love with his best friend and I know this is crazy! I have no idea why every time I meet him I'm feeling so happy and comfortable. I've meet him since the first month I'm in a relationship with my boyfriend. It means that I've this feeling for 3 year plus too. The weird things is, his best friend studies overseas and I barely meet him. Only once a year or maybe twice. I really have no idea why I got him in my mind, I barely know him or him personality but I miss him. I don't even have any connection with him but I just really adore him.

After I get to know that my bf cheated on me, the feeling I have for his best friend is getting stronger and stronger. I just feel like I want to get close to him and know more about him. What should I do?