Myrtle- Immoral or not?

Myrtle is soooo immoral. While she is Wilson's wife, she is also Tom's lover. She is a liar and a big cheater. She doesn't care about her husband at all. She is very materialistic. She only cares about wealth and that is the only reason she loves Tom. I mean why else would she like Tom, he is so old and ugly. I feel sad for Wilson because he doesn't deserve to have such a wife. I know that he is boring and a loner, but he is still her husband and she should accept that. I am happy she got killed, but I would've been more happier if Wilson had killed her. I mean she deserved that. Wilson cares about her so much that he cried endlessly after her death even though he knew that she was cheating on him. He even killed Gatsby when he found out that his car had killed her (which was not true because Daisy had killed Myrtle).