Is Valentine's Day such a huge deal to some people?

I have seen a lot of stuff on the internet where it's apparently life-ruiningly bad if you are alone for Valentine's Day. Is this some weird American subculture or is it actually widely considered a big deal? Lots of countries don't even celebrate or if they do, it's a Saints Day not this 'love holiday' so I'm confused how big it really is and why it matters so much to some people.

Is Valentine's Day such a huge deal to some people?
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