Why some guys are so jealous and some aren't jealous at all? Or they just pretend like there're not jealous?

celestiika
I had an ex boyfriend who was jealous at everything. He would get mad even if I commented some guys MySpace or because I had guys on my top friends. So I got used to the idea of guys being so possessive. And then my boyfriend is the complete opposite. Guys could practically come and flirt with me to his face and he wouldn't care. Its not that he don't love me, but sometimes I do miss getting a guy jealous. I miss the attention. Do you really think a guy can't be jealous or he's just pretending?
Why some guys are so jealous and some aren't jealous at all? Or they just pretend like there're not jealous?
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