This is the moment a boyfriend humiliated his 'cheating' girlfriend by exposing her alleged affair in a fake marriage proposal in front of a room of diners.

Footage shows him hold the attention of people eating brunch as he makes an apparent declaration of love in a video reportedly filmed in the US.

In the video, which was Tweeted here, he turns to his partner and says: 'I have absolutely loved you, introduced you to my son and I wanted to spend the rest of my life with you.'

As smiling diners enjoy the spectacle, one reaches for his phone to capture the apparently tender moment.

But instead of dropping to one knee, he reveals to the room full of people that he has 'discovered' his girlfriend is having an affair.

The man appears to confront his allegedly cheating girlfriend after beginning what looked to be a marriage proposal

Rather than slip the ring onto her finger, he drops it in front of her face on the plate, swears at her and leaves the room stunned.

As the video cuts out there, viewers were left wondering what happened next after it was shared on Twitter.

After a tender beginning, the proposal prank ends with him placing the ring on her plate and walking out of the room

Some backed the bogus proposal, with one saying: 'You deserve better than this, king.'

Another was more critical, saying: 'I would really like to see a follow up? I think the potential for a great video is there, but the delivery was less than optimal.

Some viewers left messages of support after the video was shared on Twitter, but another questioned why the woman's face was hidden throughout

'I wanna get invested more in the characters. Like why can't we see her face?

'Also, it would have been nice to see her become overcome with joy followed by a soul crushing reveal.'