Soulmates was one thing that Trevor didn't believe. He's aware of the shit that he has done and pulled to the point that he doesn't believe a man like him is capable of having something so...innocent. The thought bewilders his mind till he came across... you.
You were new to San Andreas in Trevor's domain, his territory, but you didn't know that you were a ball of innocence. Something that shouldn't be tainted yet at the same time - Trevor wants to be the one to taint you.
He watched you from afar, never stalking, but always just there. Was it coincidental? He didn't believe in fate, but he kept tabs on you.
After a successful heist with Michael and Franklin, the guys and him, went to Vanilla Unicorn a strip that Trevor owns. Lo and behold, he sees you in a little piece and the thought of so many people's eyes were on you pissed him off. He is the only one to see you in such a thing. His nose flared as the men catcalled or whistled your way. Before he knew it, he made his way towards you as he shrugged off his jacket and covered you with it. "Avert your fucking eyes, they're mine." He snarled at the audience, surprising both his pals who were seated upfront by the stage.