Why is my ex gf doing this?

i love her so much, we were together for over a year and we only saw eachother 15 times but we made the best of it, we talked on the phone all the time, and we wanted to be wit heachother forever and ever and loose our virginity together. we had our 1st kiss, make out, and all of that togehter. rly special right. well she broke up with me 2 months ago and now she is dating a guy she knew for a month. she rly likes him and she compares him to me alot. i say is he better than me? and she says he's a better kisser, hugger, cuddler, and he ually satfiyses her more , he knows what he is doing he had with 5 differnt girls and knows what to do rather than me. i never done that before i met my ex but i tried my best and s and she did feel good but with him she says its amazing and she said his is big, he has like a 9inches as she said and my mind is scarred from hearing that. but anyways why is she killing all my cofnidence, its making me feel like worthless and that im ugly, and making it sound like cant kiss, when we were together all she told me was our perfect i was, how hott i was, said i was the cutest guy she ever saw, and that i was an amazing kisser , perfect body, big , all of that, but why is she doing this comparing. she says she loves me as a friend and cares for me alot , she even told my sister that but why is she comparing him to me and making me sound worthless, she even told me she wanted to be back with me later on if this doest work. but she is falling for him and im scarred she will loose her virginity to this guy rather than me. and it kills my mind. but does she do this stuff now because she has a bf now and she has to say nice things about him or is she making me jealious? and playing mind games to test to see if i get mad because i promised her i wont get mad anymore. i want her back more than anything, but why is she hurting me like this, telling me she does seuxal things with him, should i ginore her to get her back or should i make her jealious and say i started talking to a girl. we are both jealious types and idk what to do.