I worked on myself a lot, lost weight, gained confidence, approached, got a job i love, found my career path, and enjoyed life. I tried to be myself, what that ended up being was a funny, open, vulnerable, and outgoing guy. I met this girl a month and a half ago she was very attractive but we hit it off big time. We loved being around each other. I opened up to her, told her about me, and she told me about her, even deep dark shit. I find out her ex walked out on her with no communication at all just disappeared. speed up to a week ago, i was very busy, couldnt see her all week. She texts me that her and her ex got back together. So i find time to meet her to figure wtf just happened because we were enjoying ourselves a lot. Context before i continue, she was with this guy a while, she obviously liked him because she got an IUD just because he was interested and she was too, he turns up out of no where explains what happened and gives a reason for disappearing but agrees he made a dick move. So me and her meet up, i find out she met him the day after i last saw her, and decided to give it a go again. Now upon talking to her in person thats where i have been crushed. I find out that even though she absolutely loved her time with me, she chose him over me not because of time, not because of history, because in her own words hes the opposite of me and she enjoys "the chase", he isn't open, he doesn't talk a lot (i do), and he isn't as affectionate as me, the only similarity is that she said were both soft. This is exactly what she said "Now that you're here in front of me, i know for sure that i made the right decision" Fuck. I've been told a lot by girls even within one night that they couldn't believe how comfortable and how they already feel something because i don't care i show affection whenever i want and i am very physical. She then ends it with she enjoys the chase and she knows he isn't good for her. Guys i have improved myself so much, but here i am crushed because i am still the nice guy and the bad guy got the girl. This crushed me because me and her hit it off so well that i enjoyed my month and a half with her more than my long term relationships. We got very close emotional, and it got hot and we fucked one last time even though she did not want to be a cheater. But i can't remain like this, i want that to be the last time i am the nice guy, but i don't know what to do. How do i get out of this rut, how do i achieve this "chase" while still being true to myself. I haven't felt this crushed even after my last 3 year relationship because i know i've worked hard to improve and had such a good connection only for this to happen. Please give me some tips, something to push me in the right direction to become the bad guy, or achieve the chase.. I want to genuinely become the bad guy with a soft side but how do i do that?

TL;DR Worked on self drastically, approached with a lot of success, found an awesome girl dated only for her to leave me for her ex who disappeared on her for months then randomly returned and she said it was because she felt the need to "chase" him even though she knew he was bad for her. Need help getting away from the nice guy and being the bad soft guy instead.