Originally Posted by RunningMan
Since like I said, I have never been "truly" monogamous.
So few have that I'm of the opinion that "truly" monogamous is a myth.
Leaving literature around, hinting at it in conversations, I'm of the opinion that this is not going to work. Unless you are content to be pseudo-monogamous for another decade (that sounds horrible) I suggest you unambiguously talk to this man. If you care about the relationship and have a desire for him to come on this journey with you then beating around the bush is just doing harm to you and him.
Pay him the courtesy of treating him as an adult. Tell him honestly (and gently) how you feel. Just say it, don't hint at it.
That's my take. Good luck