Sexual tension between friend and I

I met John (not real name) on my first day at a new school and he was one of my first, and best, friends that I've made. We had a strong friendship, often spending time with eachother in and out of school. Just to clarify, I'm bisexual and he is definitely straight at the very least. i was never attracted to him more than a straight guy would be attracted to a close female friend, but we would share heart-felt secrets with one another, and he used to play the guitar and sing to me all of the time (something which I never saw as anything special at the time). I stayed round his the night before an exam we were both taking, and decided to come out to him, despite him having already figured it out. He rather casually told me he thought he might be bisexual too, but I left it at that. About a week after that he had a small gathering at his, and we were sat with eachother in the garden, when I could sense the immense sexual tension. He leaned in as if to kiss me and was looking into my eyes, but we heard someone coming and he quickly acted normal again. The night was a bit messy after that, people were upset, I saw John get very upset and it was a rough time for our friendship for a while. Over the next year we drifted apart for unrelated reasons, still good friends, but not as close as before. I've just spent the last week with him, and others, at Leeds festival, and the sexual tension returned. Before an act they were playing music, with lyrics about "loving you" or something, and we caught each other's eye a lot, registering each other but not wanting to give anything away. This sexual tension continued for the next couple of days. Any ideas on what I do? If he is interested, then I couldn't imagine of someone better to be with!

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