How can you tell if a guy is jealous?

i have been trying to stay friends with my old friend with benefits. have always could tell him everything in the past. he has asked questions about my last ex b/f. I always answer them. he knows who my ex boyfriend is. every time I answer quetions he slams me or says how could you date him? what were you thinking? once should of been enough. why were you with him? how did you get mixed up with him? is he jealous? if not I don't understand why he talks to me that way.
How can you tell if a guy is jealous?
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