women... please help a guy out

Ok i apologise in advance because this will prob be a long post but i just want to explain everything so i can get an accurate answer.
My girlfriend and I (shes from London and im from the south of spain) met at university 3 years ago and pretty much fell in love just like that. We lived together throughout uni and then moved in together sharing the same room but in a house with some other friends. She was my first and only gf and i was also her first and only serious relationship. She always used to say how lucky she was to have met me and that she loves me so much and to never leave her.
I've been through my fair share of problems with my family and also suffered from anxiety last year which led to me not working for awhile and having to rely on her, i know it was hard for her i could tell. but still she always said she'd never leave me.
After my anxiety i tried to get a job but failed, i could have tried harder to be honest tho, i was content on living like a bum really.
we didnt go out n have fun and we were around eachother 24/7 which meant that we didnt appreciate eachother's company as much as we should have... it became a complacent relationship. I wasnt the guy she fell in love with because i used to be so driven and ambitious and competative but the fu*king anxiety sucked all of that out of me.
Well i came back home mid august for the summer and got a job for a month and then went back to live with her at her mum's which initially she seemed excited about... i was only there for 8 days and she then told me that she didnt love me, booked my flight home n kicked me out basically... just like that, we didnt even discuss what was bothering her.
Well when i got back home she then started to say that she didnt know whether she loved me or not.
So i decided to go back to the old me, im working, passed my driving test, go 2 the gym everyday like i used to, im going out and actually drinking again.... and she knows that im doing all these things.
It was 5 weeks that she broke up with me this past monday and since then i usually call her or txt her every 2-3 days asking her why why why or is there a chance or this or that... one day she says she still has feelings for me n the next she says she doesnt... says she doesnt wanna get with or be with another guy. Well I/we decided last thursday to not contact her to see what happens and its been 6 days 2day and i really wanna call her its doing my nut.

Ladies... what actually goes on in your heads?
Please for the love of god enlighten me!

Cheers,
Monkz.