Guys, Why do guys do this to me?

A guy will tell me he likes me, and is okay with it when I don't have the same feelings. But if I like someone else or talk about someone else at all they get jealous and mad at me. I don't understand?
Updates:
+1 y
I don't understand. Why lie tho, I never lie to them.
Guys, Why do guys do this to me?
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