I wonder if it's because he doesn't want a magazine deal with hello paying for the circus of a wedding and invite celebrities they don't even know just to make the wedding look amazing. When Katie Price married Peter Andre, it was covered by ok magazine, in the tabloids a few months later, it was said all these celebrities were invited that they didn't actually know of or had come across once or twice just to make it glitzy enough to sell more magazines. Rubbish really but it's what they do to make mega money. Imagine being invited to a wedding and you didn't have a clue who the bride or groom were.
I don't think her Dad helps, every time BBP sees him he gets a lecture from Dave that he needs to ask Sam to marry him and it's disgusting they have kids but Sam has no ring. I guess it puts you off the idea when people constantly keep on about it. Maybe he likes winding her Dad up cos he knows it annoys him, who knows??? It's got to the point though on the mummy diaries where she was literally begging him to marry her. Does Sam want to be a wife in all honesty or does she just want her day????? They are as good as married apart from the ring, and Sam is pretty shallow, but marriage is more than a name change and a pretty photo in a wedding dress.