How to tell my best friend that I am in a relationship?

I used to have a crush on my best friend, but he moved and said he would never be interested in a long distance relationship. I accepted it, but was sad at the time. We stayed friends and I never brought up my feelings again. I thought I would never meet anyone else. Well, I ended up reconnecting with an old crush at a party and he and I have begun dating. My best friend can be arrogant and sometimes acts like he is God’s gift and that I will never like anyone but him. I want to tell him that I have moved on completely, but I don’t know how to say it without hurting his feelings. Any advice?

How to tell my best friend that I am in a relationship?
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