You're right that would be the best advice. Because once you go down that road Guy 1 will never be the same if he finds out and you will never feel as close to him again because Guy 2 will always be between you even if you don't tell him. I understand very well where you are coming from. Been there. Lost the only man I still deeply love. Be very careful and don't think with you sexual attraction it will get you in trouble every time.