I felt for both of them but felt neither handled it well she shouldn't of lied and she should of went to Mark straight away when she knew she's been set up but his rejection of her and even Tyler the last time as well as how judgemental he is, I can see why she would fear the same again she is incredibly naive. The way he speaks to her like a child isn't something most grown women would tolerate either.
As for him he should of known that she isn't a criminal mastermind and considered there is likely to be an explanation he shouldn't of humiliated her dragging her away under arrest in front of her family and wedding guests when he should of been marrying her that was cruel he was supposed to love her.
She shouldn't of brought up Kate & he seems to have forgotten Kate also lied at times and had her flaws and he's given her a posthumous saint hood status in his mind if he carry's on like that he'll only end up alone.
I hope they get them back together eventually they need their heads knocking together they both deserve each other quite frankly.