Why is my ex girl-friend living in denial. I don't even think she likes her current boyfriend?

she cant deny the physcial attraction we had between each other. i like to call her from time to time and check up on her ya know and everytime i call she brags about her new boyfriend.. and how happy she is and how perfect he is.. and all this stuff. I don't believe she really even likes him because people who are in love dont feel the need to brag about it 24/7. She says she no longer has feelings for me but i don't believe it. She told me he was gonna "tickle her with a feather while she's sleeping"..um, lame.