How to deal with jealousy?

My boyfriend and I were talking about it tonight. I have always been a jealous person, since I was a young kid. I get crazy levels of jealousy with my bf but I do my best to reel them in. I never attempt to be controlling or restricting and say he can't have friends that are girls or anything like that but he says he can tell when I am upset about it, even if I don't say anything and do my best to hide it he is just crazy observant and always notices when anything is slightly off with me.

He doesn't want me to be jealous and doesn't understand why I am. I've never been cheated on in a relationship before so he doesn't understand why I have such serious trust issues. But I never saw it as trust issues I saw it more as primitive evolutionary feelings I had no control feeling. I just had control over acting on it and I do my best to never act on it. Though I guess there is also a part of me that just has minimal faith in humanity when it comes to certain things. I apologized for not being as trusting as him and said maybe it just took me longer than him to trust. I don't know. I could really use some advice. I'd love to stop being a jealous person but I really don't think that will ever change.