I have been with my boyfriend for over four years, and I consider him my best friend. I can be the jealous type, and tonight I checked his personal email account (he had given me the password awhile ago). I found an email from a female friend of his that indicated they had slept together. I suspected this and have asked him directly in the past if he ever slept with her, and he denied it. I know I shouldn't have spied on him, but I don't know what to do now. I am really upset that he lied about it, but I can't confront him without admitting that I read his email. What should I do?