Just dwell in the L
Let your soul marinate in the despair.
Be brave, embrace the nightmares of her getting her back blown out by a dude with a bigger dikk than you....they will pass.
One of the most important lessons of manhood is learning how to let go of a female. No need to stalk, no need to become depressed and suicidal, no need to get violent with the woman...let her go. Life goes on and theres always somebody else that will come along for you to be with