Boyfriend or best friend?

I went to school with his guy. The whole way through school. We where best friends, always close and never fell out. He was dating my cousin briefly month or so. Then they broke up. Now a year later we got really close and he asked me out last night! Should I say yes? Or no? I love my cousin but I want to be happy. I've NEVER had any guys interested in me. I was always bullied and picked on for being different. 

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