Hey Everyone
Thanks for all the advice. In the end I decided not to get back together with her. It basically boiled down to some stuff that happened a few weeks ago.
I hung out with her and it seemed fine as friends to be hanging out. I was enjoying myself and it was a laugh. However, she then texted me the next weekend a random text, which she clearly meant for someone else:
"Hi.

See you in an hour. x"
People do send texts to the wrong numbers. I have done it and I have had it happened to me. Of course, the normal thing is that when it is pointed out, the original sender apologizes and asks how their friend's day is going.
My girlfriend never replied after I texted her back "Huh?"
Of course, now it's pretty obvious she was trying to get me jealous at the idea of her hanging out with a man on a date. I realized it genuinely doesn't bother me. I would have liked to have been able to got her back one day as a fuck-buddy. I genuinely don't care now. She's someone else's problem and I'm glad I no longer have this problem in my life anymore.
Also some stuff on my approaches started to come together. I have gotten better at day game and got some number closes, which evolved in to dates and 2 open relationships with 2 girls. So I have been surprising myself and having fun with women I am attracted to. I have also made new female friends.
So I feel like this PUA journey is worth it and that I am much happier doing this stuff, regardless of the painful learning curves. I am much happier living as a PUA, than trying to be that woman's exclusive boyfriend ever again.
Thanks guys for all the help during my time of confusion.
Just wanted to let you know how it turned out.