Same here.
My girlfriend and I broke up for 1 month already. She said it to my face saying she doesn't love me anymore, and it was because of her ex-boyfriend. She said it was not because of him. But I know it was. They went to a movie just after our broke up. She's my first love too. I still love her. Everything seems to remind me of her, every person we knew and that we used to hang out together, every little thing that we have done before. It kills me inside. Yeah I'd wish I never knew her too. The pain inside. It hurts every morning when I open my eyes and hurts even more when I go to sleep at night.