Thank you for your input!
You're right, I don't want to discontinue the relationship. I also don't want to keep lying to someone I love. What I'm worried about is either being completely ostricized for being "sexually deviant" or either one of them being angry for me coming clean about what was said/done by either of them! I have such deep feelings for both of them that I would rather keep my mouth shut than hurt either one of them.
I do feel I should discontinue my romantic relationship with her because it does weigh on me and that's not what love should be.
In your opinion, do you think I should tell both of them about my relationship with her and what he's confessed to me? I just worry about betraying trust and causing discord in their relationship.