Why is he jealous?

Anonymous
I dated a guy for 4 months, we broke up on 27 Feb. We still talk as friends, but every time I go out with another guy, he has a fit. Will text me, email me and tell me how he is jealous, and ask me not to sleep with them. What is the deal? I told him last night after he did this again, he isn't being fair and needs to either step up and say how he is feeling or keep those thoughts to himself. Why do you think he is saying those things in the first place?
Why is he jealous?
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