In love with my "straight" best friend.

Something of an age old tale in most stories of gay men. I've fallen in love with my best friend who's "straight". The reason for the quotation marks is that, myself and my friends aren't 100% sure he is straight, many of them are sure he isn't. I've known him around 5 years, and even then I had a light crush on him. But it wasn't until just under two years ago that the feelings started, and now they're deep. Our current relationship isn't exactly "normal". There's a lot of jealousy on either side, him being jealous when I talk to boys and me being jealous when he talks to girls. There's been moments of intimacy, but nothing majorly physical, a touch here and there. There's no doubting that we have an immensely strong bond, which mostly materialises in him being angry at me, which I've perceived to be him struggling to come to terms with his feelings and sexuality which makes him resort to anger. I believe I am in love with him, I've had two boyfriends before and have never ever felt like I do for this boy. He is truly one of a kind, and I don't know what to do. I'm scared that if I asked what was going on it was scare him and then I'd have nothing, OR that I'd just completely misinterpreted every thing.Help me.