Hey, I went through the exact same thing. It was very heart breaking, I was depressed crying day in and out. I found letters, phone calls, and gift receipts. I ended it and he wouldn't let me go. So thinking I must have meant something, gave it another chance and another..... All he did, was became more hidden with his deceit. But after a while, did get over the situation and I realize that I DESERVE better. If he really felt that I was worth it he would have let her go!!! When you are in love and love someone it can be blinding. She's playing you and taking ou for granted. Let her go and maybe she would realize what she had. But you deserve better. Keep your mind busy and occupy your time. I know it seems like it will not get better, but time heals all wounds.