I am getting overly jealous....i need advice?

I am getting jealous of my boyfriend talking to ther girls. He has more female friends than guy friends. He still talks to some of his ex's. He says that I am insecure which im not, just insecure about this realtionship. It wasn't like thi in the beginning of our realtionship. We been togeter for 2 years and this started happening about 6 months ago. I know that he is getting fed up and might break up with me. It really relies on him being with me. I honestly do love him with all my heart but i dont show him that i dont. I dont want him to leave over something so simple. I know that we can be happy again. I just feel like once it gets good again we fight and i have to start all over again. I cry all the time because i feel like i dont make him happy. There is a void in out realtionship and i dont want it to be filled by another woman. I am soo scared of him hurting me and breakingmy heart that i am miserable. I dont think that he is cheating most of the time. But he is so private. I want him to be open with me more. I am not trying to hurt him but my jealousy is the problem. Please help