How to deal with a possessive boyfriend?

This has always been the only issue throughout the 5 years together. He's not as bad as he was when we first started dating but it's still an issue and it really takes a toll on our relationship. He doesn't like it when I talk to other guys in public, if I have male friends, when I'm at work. Tells me he has trust issues because of his upbringing and past relationships; it's very frustrating that he doesn't seem to fully trust or respect me.
How to deal with a possessive boyfriend?
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