Why do some boyfriends get jealous so easily if you talk with another guy?

I just don’t understand the insecurity. Once I was dating a guy who got so possessive that he damn near forbid me from talking with any guys when he wasn’t around. I got out of that relationship but still I think why was he like that? Why did he fear me hanging out with other guys when I should know I’d never cheat on him.

Why do some boyfriends get jealous so easily if you talk with another guy?
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