HOW DO I GET HER BACK FROM HIM!!!!HELP!!!!?

ok me and my ex girlfriend broke up about two months ago. like two weeks ago she told me she is now seeing someone. She expected me to get mad. I did the opposite, i told her "oh thats cool i wish you two the best" and she was shocked i said that. Later she tells my sister i have finally changed (i used to be imature and self centered). She says i am better now that im not selfish. Me and her right now are like bestfriends again. So her and her new bf only been going out for i think about to be two weeks and i get a text from her like at 1 in the morning. She asked if i can talk and i said ya and she said that her new bf "freddy" was drunk and they got into an arguement and he told her "dont even bother calling me back if you do someone else will take ur call"...She was hurt. I was there for her and i told her to cheer up and dat i was sorry he was acting dat way...(sounds like this guy isnt such a nice guy after all like she said he was).. Ok i never used to get mad the only thing i did was make dum mistakes and hurt her feelings with dum jokes.. They made up yesterday but i have a feeling he will mess uup again sooner or later... HOW DO I GET HER BACK... SHE SAYS SHE STILL CARES BOUT ME ALOT AS A FRIEND THO... WE ARE LIKE BESTFRIENDS AGAIN LIKE WE STARTED IN THE BEGGINING... HOW DO I WIN HER BACK FROM HIM...(OH YA AND SHE TOLD MY SISTER THAT ME AND HIM ARE IN A WAY "THE SAME" JUST THAT HE IS OLDER THAN ME... "BUT" THE THING IS THAT I HAVE CHANGED INTO A BETTER PERSON... SHE SAID WE CAN HANG OUT WHEN EVER I WANT.. SO WHAT DO I DO... I NEED A PLAN...