You fumbled really badly but hey you only live once. Either move on or work on yourself in the small hope that this person will once again be single again (Though I wouldn't recommend that path who knows? Third time may just be the charm)
Plus are you absolutely sure this girl is dating someone else? Maybe figure it out before you take your next s......
Maturing is realizing that nothing in this world matters in the grand scheme of our existences
But for that very reason, something in the grand scheme of everything matters evermore for us
