How to deal with a possessive and jealous partner

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I have been with his guy for six years now. We've been through a lot. I must admit, he didn't even court me. We just found ourselves dating even if he has a girlfriend then. In fact his girlfriend broke up with him when she found out about us. At first, we really are a happy couple. I am very much excited to see and be with him each day. His friends and my friends as well may know that he didn't court me but for me it doesn't matter anymore coz what's important is I believe that we were bound by love and trust. Our relationship gets stronger each day. WE surpassed every trial that comes our way. we proved to everyone that nobody/nothing can come between us. we were happy and contented having each other. we built dreams and plans for our future. we even made a promise that no matter what will come, we will always have our love to keep us together and stronger. He had been very protective and came to the point of being so possessive. at first, it didn't matter to me. I was even flattered then knowing that he really loves me, that's why he became so possessive. but later on, it already became the reason for our fights, arguments, etc.. He had been so jealous for no reason. he's accusing me of seeing and flirting with another guy. he always checks my phone to see who texted me, etc. He sees to it that he knows my whereabouts-where I've been and who I am with. He seems to treat me like his possession.. He even intrudes my privacy. He checks my mails, wallets, etc. without my knowledge. Gosh!!! HE's been hard to deal with. Worse is, he's preventing me from seeing and being with my friends.. I opened up to him about this and told him to change his attitude or else I will surely leave him...With this, he promised yo change but until now he's still doing the same thing. I still love him very much but I really can't bear being with him..IF YOU'RE IN MY SHOES, WHAT WILL YOU DO?