Even with three million people in the metro, you’re lucky if there’s one degree of separation
Sure, the dating pool seems deep, but once you start sorting people based on age, education, interests, etc., it starts to look really shallow. Seattle is the smallest big city in the country, a place where everybody seems to know everybody, so don't be surprised if your date turns out to be your roommate's ex's little sister/brother.
Din’t hear from your date? Don’t worry about it.
Seriously, they probably didn't want to impose. Ring 'em up and ask 'em out again... and hey, have you seen the weather lately? It's not like you can get MORE depressed than you are already, so who cares if they blow you off?