I think it's run out of gas then. And I'm kinda surprised it didn't earlier. Long relationships without tangible commitments (a ring, a living together situation, etc.) are hard. Long-distance relationships are hard. Combine the two and the odds of continuing are not great.
Pick yourself up. Dust yourself off. And give some space as you cultivate friendships where you are. Friendships with people of any gender, I might add. Just, have human contact where you live, and live your life. Don't hang around by the computer or the telephone, hoping for a reconciliation. Create your own personal fall-back plan now, because you didn't do it earlier.