I don't understand this leo guy at all?

I'm a scoprio girl who has a real interest in this leo guy, but our intense agruements gives me such a headache and heartache. We had an extreme agruement yesterday when I told him about who I was missing and he flipped out on me. He asked me so I was being honest and I'm still not sure why he really flipped out. It was either because he was acting like a protective brother (we are bros and sis) or if he was jealous. I told my real feelings for him before and he told me the same but we didn't date because he doesn't want to ruin our friendship which was what I told him before. Well after flipping out on me, he tells me he reminded me that he didn't want to date me and I was a bit confused on why he told me that for. I told him we have such a damnn messed up friendship and he tells me it's messed up because it revolves around my happiness and how I always have to get it my way or else I'll be mad. Honestly, it's true so I told him he shouldn't be my friend anymore and he told me fine. We haven't talk at all and we won't be until next week when he returns and if he or I will apologize. I for one will not apologize because I hate how unhappy I am when we talk. Until I figure out how we can fix things, I'll stay away. Anyways, I need help on why we agrue and why he upsets me soo much? Perhaps it's me? Please don't give me a mean answer. Thank you in advance.