As someone has already said, if she's going to leave you, she will. Nothing you can do about it.

So why stress?? If she does go away with another bloke, then that means you're single and can get down the pubs and have some random shags from loads of dirty burds!

Women's behaviour is stuck in an evolutionary hole. They can't help it, it's all about providing for babies. So, if they get the attention of a fella who has more money than you, you're single again basically.... So, worrying about it will get you nowhere.

Anyways, my advice?

Just crack on with your life, tell her if she's not happy then she may go. I bet that will make her realise that you will be just fine without her thus, in the logical female way, make her want to keep you even more. Odd but true!