Hmmm, i think maybe you should just forget about who he is dating and move on. After all, you are split up, so it shouldnt be any concern if she looks like you or is younger and more beautiful, or is a lot more fun than you, and if she makes him laugh and has better times together than you two did. I dont think he has gone out purposely and found someone else who looks like you. People are attracted to different people. Personally, i think you are a little jealous and have never really got over him. I think you should just try to move on and accept that things are over between you two, otherwise you will grow bitter...