I'm glad the "coffee" date went well. I know it hurts to see him so happy and he treated you just like a friend, but that's how they are at times. His life right now is exciting and he's like a little boy on a camping trip out in the wilderness exploring the world. When the responsibilities and the day-to-day stuff starts tumbling down around him, that "happy as a clam" appearance will disappear...but it takes time to do so.
Now what? You take care of yourself. You left h w/some good thoughts. Allow him to come to you. Do not contact him unless it is an absolute emergency.
Keep the focus on you. What are your plans for the weekend?