He wont have to live in Singapore forever but that appears to be his plan at the moment. He's been there for quite awhile and seems to be loving it. It is a great place to be young, rich and good-looking. It's going to get old if he tries doing it for the rest of his life though. 10, 15, 20 years down the road is where that regret will kick in.
Sure there are plenty of other great places to live than the United States - but his career trajectory seems to be in tech. Thats where he is continuing to invest and put his time. All roads in that arena lead to California - a place he just voluntarily gave up the right to ever reside, work and do business in.