Being accused of friend-zoning a friend?

I don't know how to put it. He was always my friend. For me he was happy, chirpy and sometimes he would tease me with stupid jokes like, if I eat your half eaten sandwich I am directly kissing you... stupid stuff like that. Whenever I would get cautious or ask him to explain he would accuse me of imagining things. But then, last week, a guy I liked in college proposed and this good friend of mine went berserk, accusing me of "Friend-zoning" him. I never wanted that. I never meant it. Could any of you guys explain me what's going on and what should I do?
Being accused of friend-zoning a friend?
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