Me and him know each other since 4 years, and we've always had really good relation. Tho, last year, we didn't have much contact. We had a small arguement regarding helping each other with university stuff and he got mad at me – yeah, I demanded too much. I apologised him later on, but that's not the story.
Before, we never had any "close" situations. No kiss, no erotic stuff, not even emotion.
Lately I met him randomly in a shop, prior to my birthday last weekend, and invited him to a birthday party. He came there, it was an outside-party, we went to beach and then to some clubbing. I noticed him changing over the year – he himself got more confident, also his body is way different now, he gained lots of muscles here and there and I liked it. He grew up, I'd say. And well – i was looking at him first time in my life in a different way. He seemed like a new person to me. We started dancing too, we were both relatively hesitant at touching each other, but each touch of him during the dance made me feel burn inside.
Right now I am, like, 4th day in a row thinking of him all-day and I think of reaching out to him about my emotion. How should I do it? Is it worth pursuing? Wouldn't it destroy the friendship? I am getting frustrated because I don't know how to release this emotion.