It’s wedding season and as many couples get ready to say their vows, they may want to have a talk about fidelity — financial fidelity.A study by Harris Poll for the National Endowment for Financial Education finds that two in five Americans who have combined finances admit to lying to their partner or hiding information about money matters.And it’s on the rise — 42 percent of those surveyed admitted to financial infidelity compared to 33 percent just two years ago.It could be something as minor as …