Ginger, Happiness comes from within. Everyone has problems and I am sure your exH has his share of issues. If his marriage was that great, why is he off on a solo vacation and why is he enjoying it without his W?
Assuming he is not faking his happiness, he is happy because he chooses to be and sees the positives in his life. If you leave the being single part aside, you have so many positives that you can focus on and be generally happy.
