Clearly, you have not bothered reading about fascism to associate it with Valentine's day.
The essence of fascism was best laid out by Mussolini's famous: everything for the State, nothing against the State and nothing outside the State. A fascist is someone who believes that the community or the nation must be put before the individual. It is someone who would defend whole heartedly the idea that it is the government's job to police your behavior and your speech so that they fall in line with a grand social vision. It is someone who thinks that businesses should subordinate their activity to this social vision and who thinks that failing to do so warrants punishment. It is, in other words, someone who fundamentally does not believe that individual rights are anything besides privileges the State granted and can therefore revoke. That's fascism.
Now, Valentine's day is an entirely private matter, involving only consenting parties that are not obligated to celebrate it, to celebrate it in a peculiar way if they do opt to celebrate or to be even be together in the first place. This conception of romance and free association is profoundly individualistic and, consequently, it is deeply antithetical to fascism. More to the point, in my experience that it's the people who cry to the facists who are the most eerily similar to them. They're all completely oblivious to it, usually on account that they have absolutely no idea what fascism truly is. Feel free to rant about Valentine's day, but calling things fascists cheapens the word and understate the very real horrors that people suffered because of real, as opposed to imagined fascists.
As for my personal opinion on that day, I think it is nice to have a day on calendar where you plan a special date. It so happens that my girlfriend loves romantic gestures and that she didn't get to enjoy much of them in the past. Last year, I remembered that she told me no one ever got her flowers, so I got her white roses (her favorite color) and wrote her a poem. This year, I knew she was a bit moody because of something that happened at work, so I surprised her with flowers one day ahead. She got the night off both years and we used it to have a nice diner at home.
Why anyone would have a problem with Valentine's day is beyond me. If you do not like it, just skip it.