Why did george and Lennie leave the place they were at?

Lennie had gotten himself in trouble in Leeds because he had seen this girl's red dress, and being so simple minded and naive, he felt the need to feel the dress (with no interest in the girl) Because like a child, he liked feeling pretty / soft things. The girl mistakes him as a rapist or was going to attack her because of his size, and screams. Lennie was frozen with fear and could only hold on. George was near by and had to hit Lennie until he was conscious to make him let go. In fright, the girl runs in town and claims that she's been raped. Lennie was being lynched by the mob of angry town people, and so Lennie and George had to get out of that town and begin a new life.