I agree with the above about young 20-somethings starting out their lives together as opposed to people in their late 30s who've been living together for 15 years and have three kids. What heartfelt/traditional/cheesy 'starting out' sentiments are there to express that have any relevance? It's normal to make speeches and comments contrasting their new happy all-grown-up married life with their previous young, highly exaggeratedly sad, lonely, miserable single existence and how it's now all-change in their life; but it would be awkward in the extreme to compare her new life with this husband with her old life with that husband.
I'm not saying that anybody should feel forced to stay in an unhappy marriage, and it's completely different when you're the innocent party whose former spouse treated you appallingly; but there is an inherent feeling among many that, if you don't appear to take marriage seriously, why should they?
Contrast this with the experience when an old widow and widower meet and both find love for a second time. Even if the couple themselves want it to be low-key, their families and friends are usually full of excitement and happiness for them.
I had a not overly close relative who had been with Jane for quite some time. They appeared to be very happy together and we were really chuffed for them when we received a wedding invitation as we'd always thought how lovely Jane was. When we opened it, it was 'to celebrate the wedding of Mark and Sally'. We trekked a long way to the other end of the country to go and support them (hardly anybody else on his side other than his immediate family was there) and it was a nice enough occasion, with a few subtle suggestions that there might have been a pregnancy involved and a number of other things that didn't really sit right with us - there was a bit of a cloud in the air and definitely none of the normal 'all loved up' feeling of two families joyfully coming together.
The next time we saw him, we were introduced matter-of-factly to his new wife Cathy, who was pregnant. They subsequently went on to have a second child and AFAIK, he's still with her, but there was no acknowledgement of what happened to Sally and we hadn't been invited to the wedding with Cathy - I don't know if it was a muted affair or not.
However much you wish them well, it's hard to get too excited n their behalf. Maybe we're BU, but we felt rather put out that we'd already spent so much and put ourselves out (I know: invitation, not summons!) to go to the previous wedding and it had obviously all come to nothing in a very short space of time.
[none of these are the people's real names]