I picture things with her and him being excellent but how could it be when she was sleeping with me
I can so relate to this! Other people have reassured me on here that this is not so. You're just not getting to see the crazy! People don't change that quickly.
Also, I've seen this first hand when I got a call from my ex the other day and she was so unsettled that she burst into tears when her new gf called her to see how her day was, and her new gf had to drive 4 hours to comfort her... . so yeah - I'm not sure she's as happy as she makes out!
It's hard though I know. Just feel sorry for the new guy - he thinks his life is so perfect - it's gonna hit him like a meterorite... . x