Seven Year Switch's Brad proposed to Tallena. Again.

It’s been a rocky road for Brad and Tallena on Seven Year Switch.

The couple, who were paired with a different partner in the social experiment, began the show by saying they had put their engagement off and they hadn’t had sex ‘in months’.

In last week’s episode, after a two week isolation period, Tallena decided she still needed another night away from Brad, leading to speculation the pair were destined for a break up.

When we visit the couple this week, Brad breaks down when he speaks to Tallena. He said after they hung up, he went 'crazy'.

"You not coming home yesterday, absolutely ruined me," Brad said. "But I've had time to think and reflect and I know a lot of things happen for a reason. Some good, some bad."

"From the moment you walked in the door, I vowed to never give up."

Brad then proceeded to give Tallena some heartfelt presents for her birthday. Included was a card, Pandora jewels and... a torn apart cheque. The $10,000 cheque meant for the pair's eventual wedding.

Confused, Tallena gave Brad a quizzical look. In response, he took her engagement ring from her finger and got down on one knee.

"I put that ring on your finger to symbolise my loyalty and trust. I trust you, one hundred billion per cent. Last night, I thought of a lot of things, but I know I don't want to live in this world without you. I want to fight to the bitter end. This will be the last time I take this off you," Brad said.

"I love you with all my heart. I want to be with you to the end of the world. You are my star, I do everything for you. I never want you to forget that. You have believed in me and helped me through my darkest days, as I will help you through yours."

"I'm so sorry for that letter, do you want to be my wife?"

Tallena accepted his request as Brad presented her with a new cheque for $10,000, the money the pair will use for their wedding.

You can watch one of the other SYS couples, Ryan and Cassie's reunion below...