India, Feb. 23 -- Nick Jonas and Priyanka Chopra's marriage is stronger than ever, with the couple celebrating over five years together. A source told Life & Style, that a key factor in their lasting relationship is Nick's ability to learn from his brother Joe Jonas' failed marriage, ensuring he doesn't make the same mistakes. By sticking to their methods and making their relationship work on their terms, Nick and Priyanka have managed to avoid the pitfalls that plagued others in their circle.

A longtime friend of the couple told the media outlet, "Nick isn't the oldest Jonas brother, but he is the undisputed leader and plan-setter of the band and the rampant perfectionism that he brings to every TJB project has crossed over to his marri...