They also have San Francisco and Tahoe in common. Andy and Tessa compliment each other so well. Tessa's like the male version of Andy, and vice-versa.
Both of them were PICKED to be on the show. It's like Andy and Tessa were meant to find each other on it. If Andy does choose Tessa in the end, it truly will be a story about fate. Here's two people who never once thought they'd be a part of something like this, much less find their one true love in the process. Their journey very much correlates to Tessa's Inca Trail story. You can find love in the most unexpected places, but you have to be willing to take a risk, and that's what they did by agreeing to do the show. Hopefully Tessa and Andy's path will lead to marriage, just like Tessa's mom and stepdad did.