Unless Tom is turned on by the idea of other men doing his woman, she would need to quit the escort job immediately. He might think that he can handle the jealousy, but wait until a time comes when he knows for a fact that she is having sex with another guy, right at that moment. All the worse if he ends up helping as her driver and is parked out front while it's happening.
Quitting the escort work will mean a significant drop in her income, plus she may now have a gap in her resume that will make it harder for her to get a normal job. So she might ask Tom to help her financially, which would mean that their relationship would continue to be based on money. Again, he might be okay with that at first, but it might become harder to accept after the first argument or two.
And as steviej mentioned, there is a possibility that she has some serious issues, either from the escort work or from things that happened before that.
Good decisions come from experience. Experience comes from bad decisions.