They were supposed to tie the knot in 2009 but some sources claim that Matthew cheated on Shannon, leaving them to breakup in 2008's winter.
By the end of 2009, Shannon e-mailed this message:
I’ll make this short (And as sweet as I can): For those of you who missed my announcement on the show a few days ago, I am no longer engaged. I called it off after learning a few things about Matt that I simply just could not handle. He’s a wonderful person with an amazingly huge heart, and I love him more than anything. But ... No more wedding bells. I’m leaving it at that, and I hope you will, too. I need a lot of privacy, a lot of support and a lot of inspiration as I begin the “healing process.”