Update: I finally found the movie. It’s called Forget Me Not.
It’s not “Don’t Blink” – the main girl sets off with her friends on a road trip/weekend trip, possibly to celebrate graduating college or high school. Each of her friends start disappearing but when she brings it up, the remaining friends are perplexed and don’t know who she’s talking about, as if they never existed and were never on the trip. I think she has a boyfriend in the movie and she tries to explain this to him.
Timing wise, this was somewhere around 2010-2016, and I would have streamed it, possibly from Hulu, Netflix, or Amazon Prime.