I had the same issue with my ex boyfriend. There is something i realized though now that i am out of that relationship. Im married now to a wonderful man. He has a ton of friends who are girls and you know what? Im not jealous at all, in fact ive become friends with them as well. He never hides anything from me. He even has two sisters and his mom is still around and still i feel fine about everything. Once in awhile ill get protective like we were at the grocery store together with the baby and some girl came up and was flirting with him while me and the baby were right there! He tried so hard bless his heart to mention i was his wife and she wouldnt get the point till i got snotty and said we got to go buy our son baby food so goodbye. ANYWAY..i realized one major difference between my husband and my ex. I know my husband puts me first, before his mom his sisters his friends. When it comes down to it the baby and I matter before anyone else and he doesnt want to screw that up, he loves me deeply and wants to be with me until one of us passes of old age. My ex on the other hand, i wasnt first. We lived together however when he had a problem he went to his mom. When he needed something he went to his sisters. I had to fight for his time and i felt unstable in our relationship because deep down i know that when it came down to it, he wouldnt be there for me. I didnt know that then, i was in love and thought i was a terrible person for feeling jealous. Ill tell you though, i did realize it when his mom kicked me out of the house and he just looked at me and said bye have a nice life. Then i was homeless in a different state for 9 days before i could go back to my home state where my family was. Its not just insecurity. Sometimes jealously is a gut signal in your body saying ok i know im not safe in this relationship whether it be physically, emotionally or what have you. Some way some how your gut knows this isnt the right situation for you so you put up a defense and become jealous in order to get control of the situation. And you dont know it right off the bat because your in love and you have yet to get into that defining situation when he has to pick if he wants to stand up for you and be there for you. You will know when you find the right man and you could care less if he has friends that are girls and could care less if he has a relationship with the females in his family because you will feel safe and you will feel like you are number one no matter what because he will treat you how you should be treated. Id say let it go, let him go. Go your seperate ways, because if your around him you will continue to harbor these feelings which will get in the way of a decent relationship with another man. Chalk it up to expeirence wish him well and walk away. There are many more men in the sea to be tripping over yourself for one of them. Good luck and if you need anything you can always pm me.