Why does my friend guy refer to me as 'boo'?

He always refers to me as boo, and I don't want to get the wrong interpetation. for example, the other day we were texting each other and I said 'I miss u' then he texted back ' I miss you too boo.' and another time we were texting and I asked how he was and he said 'Fine and you boo?' Is he trying to make me feel special like I'm his girlfriend, because I told him I like him and he confirmed that he wasn't ready for a relationship yet? Or is he doing this just to be friendly?

I don't know what to think, but when I told him I liked him he said he wasn't ready for a relationship but the thought of me and him together has been on his mind...So I'm guessing that means he likes me.

I'm not sure, he really confuses me...
Why does my friend guy refer to me as 'boo'?
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