He keeps stepping on my toes! Is he flirting?

My co-worker, who I really like, stepped on my toe really hard before I left work this afternoon. He is always stepping on my toes on purpose, telling me I suck and he always says everything's always my fault. I am always teasing him and we are always joking around. Last night I told him I was quitting and he seemed really sad. Before I left I told him it was all a joke and after he said he knew I was joking, he said "..and oh... (my name)..." then he stepped on my foot. How can I get him back over FB? Could I say something like "You are so mean. Because you did that you have to take me out and buy me a drink!" That was really bad, but I need some ideas!

Thanks heaps! :)
He keeps stepping on my toes! Is he flirting?
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