Zara McDermott and Sam Thompson's oh-so-dramatic break-up to play out on Made in Chelsea, the former Love Island star's penned a letter to her ex-boyfriend; apologising for the 'pain and embarrassment' she's caused him.After it came to light that Zara had cheated on Sam with music mogul-type Brahim Fouradi during her stint on The X Factor: Celebrity with No Love Lost (ironic) last year, she's finally admitted her 'huge mistake' and asked for forgiveness.Oh, we bloody love an open letter.