I am a man and I can tell you that it is, in my opinion, natural that we all are jealous sometimes. At the same time I think that one important distinction about myself is that I know this is one of my worst qualities. Thankfully, I have a girlfriend who is honest with me, even when it comes to romantic history, as insignificant as it may be, with people she is still friends with today. It hurts to hear but I realize that things that happened before I was in her life are acceptable because I was not involved in any way. It drives me crazy, but I am so confident that she is sincere that I can reassure myself with that thought. Bottom line: realize that all men are jealous, some are better at hiding it, someone might even reply and tell me thats bulls**t...there fooling themselves.
However
You need to confront him because marrige is a big step and lasts a lifetime. EH has crossed the line by invading your privacy. Nothing can stay bottled up forever. BOOM.