This woman may have had many consensual sexual encounters with this young man, she may have believed she was in a relationship or happy to enjoy casual sex.
All we know for certain is that she reported him to the police for raping her.
The police failed to find, or failed to forward, evidence of their sexual relationship and her willingness for sex.
This does not automatically mean that she lied about being raped. People have been successfully prosecuted for raping their partners, spouses and exes.
I am not stating that I believe that either of them are guilty or innocent of anything - just that on the facts of this case as reported we cannot know.
I cannot understand why the young man didn't tell his barrister about the many texts he received from her.