I want him to be open and honest because during that time of my life I couldn't be. At his current age of 19, I was far too afraid to come out of the closet.
To be sure he will experience pain and rejection as we all do in this life but if he develops his mind he will have the greatest tool we can own to help combat these more difficult periods and bounce back wholly healed. There is no handbook for this life but the struggles can teach us valuable lessons which can make us far better people. Each time we are burned we have the choice to complain or, conversely, to analyze what happened and move on with hopefully a new nugget of wisdom in our pocket.