Who's there ?
Your girlfriend. The one you love the most, the one who makes you happy, the one you thougt could be the woman of you're life.
She tell's you she cheated on you.
But wait !
Who's knocking on your backdoor ?
Your ex girlfriend ! The one who made you suffer, the one that you loved and desired so much.
She tells you she wants to get you back.
What do you do ?
Go.
