Most Helpful Girl
Keep the money! Reap the rewards!
But serious though, just return her half and keep yours. Becoming bitter and emotional will only make it that much harder for you. Now you can focus on future love with money in the bank. CHACHING. Cheer up :)
Most Helpful Guy
Take it. She stayed with you until she found another guy and used you for sex. She wasted your time, your life when you could have been single and might have stumbled upon someone more worthwhile.