By Katie Wilson Rebel Wilson has spoken out after fans began speculating who the mystery female tennis star she had a ‘situationship’ with was. The Pitch Perfect star made the admission in a preview extract of her upcoming book, Rising Rebel, in which she reveals the unnamed sports star made her understand what love was for the first time, despite previously only publicly dating men. She wrote: “It was like a rollercoaster. Sometimes, when I was dating men, people would even comment. They’re like, ‘God, Rebel, you can take them or leave them. You weren’t ever that invested.’ And then, here was…