FI proposed Saturday night! We went out to dinner (got all dressed up and everything) and came back to my apartment. He popped the question while we were playing co-op levels in Portal 2. He talked about how much we've been through since we started dating, how we've always worked to make it right with each other when we screw up, and how there's no one he'd rather come home to. We're going to enjoy being engaged for now and not start planning the wedding until after Closing Day, which is 5 weeks from now.
Obligatory picture of the ring: