Myrtle Wilson is a “thickish figure of a woman”(p.24, .11) in her “middle thirties” (p.24, l.12). Even though she is not very beautiful, she still seems attractive.
Myrtle is George Wilson’s wife, as well as the woman Tom is having an affair with. She lets Tom push her around, just because she forgets the poor life, her husband can give her and feels like she is part of a life she dreams of, when she is together with him.
Myrtle would rather be treated like a dog by someone who has money instead of being cared for by someone who has no money.