Dear men, what if she says 'no' to your marriage proposal?

There has been a video trending of a young couple about their late twenties where the lady declined the gentleman’s marriage proposal in front of everybody, and he resulted to taking off her shoes and packing the food they were eating together in a plastic bag. It turns out he was not so gentlemanly after all; some may argue that it was the only way he could express himself after investing in someone. But the fate of their relationship was sealed, no further explanation was needed there.

The man’s reaction in the video got me thinking, should the relationship end if she says no? I believe a healthy and functional relationship should have goals and objectives, and one of the end goals should be marriage, and if not, then why be in a relationship in the first place?