A wedding vow is meant to symbolise the unbreakable commitment between two loving partners.

But, as these stories of infidelity will show, some promises are just not meant to last.

These stories of spouses who cheated on the same day they swore to be faithful will have you thinking twice about tying the knot.

Unfaithful: These weddings got off to a bad start when one of the partners cheated on the other

The stories were posted on secret-sharing site Whisper and it was no surprise they were kept anonymous.

One of the groom's best friends admitted to 'hooking up' with the wife-to-be on the night before the wedding rehearsal.

'[I'm] at a wedding rehearsal,' he wrote.

'I am a groomsman wondering if I should tell the groom that his bride and I hooked up last night.'

Then there was the supposed 'best man' who shared a similar story.

'I slept with the bride the night before the wedding,' he confessed.

'I was the best man.'

Nervous: Many of the stories involved nervous groomsmen who were unsure whether to tell the groom they had slept with the bride

Some of the stories were a touch more bizarre and involved the consent of the both bride and groom.

'I had a threesome with the bride and groom, two days before the wedding,' was one anonymous confession.

Another mystery commenter spoke of the uneasy moment they realised they had slept with both the bride and the groom.

'The awkward moment at a wedding when you realise you have had sex with both the bride and the groom... and not at the same time,' they said.

One bride confessed she slept with her husband's best man... in her wedding dress.