When he starts calling you bro..?

Okay I'm probably overanalysing this but, last year I dated this guy for a few months and we were super close but then things didn't work out and we broke up on an 'unfinished' note. Recently we've started talking again (he started the convo) and we've been joking around and he's been teasing me a lot more such as being really sarcastic and sassy I guess haha. But he sometimes calls me bro and I'm not sure if thats just apart of the whole teasing thing or if I've just been completely friend zoned?

I guess I can't know for sure through yahoo answers but it would be awesome to have some opinions... thanks! :)