My husband is still friends with his best friend who dumped his fiancee a few days before the wedding but they are not as close now. My DH totally supported his friend's fiancee and was super lovely to her and her family without being judgemental to his friend.
My Husband was supposed to be best man, the wedding was overseas.
My husband asked the groom to be like 4 times are you sure this is going ahead and that we should book this, and our flights - I think my husband had some kind of sixth sense about it.
We get to the overseas destination and the groom pulled out - my husband and I spent the night with the bride to be at their venue for the reception and she had lots of wine. It was a sad night. Just us and a close couple friend of her and her.
Lots of people had travelled internationally for it, so my husband and I ended up hosting people and arranging day trips so that the people who travelled had a good enough time. Her mother was mortified and really pissed off.
We also helped her and her family out and visited her a lot when we got back to London, even though she lived the other side of London to us. She was a lovely lovely person and had a quite full on family so this was going to be a big wedding.
In the end she has a life long disease condition so has had a tough life but she struggles through.
I suppose it is best he didn't get married in the end but it was very hard for her.