after price reached $10k exactly a month ago and couldn't break it completely and continue the rise, the trend was reversed. but as price came down back to $8k levels to consolidate and reverse back up, a panic sell started with a big dump on 22th which is probably manipulation that caused the big crash you are talking about that day.
That's a lot of technical analysis jargon, but I wouldn't necessarily disagree with you about it. I'm not sure what op is talking about exactly when he's referring to the last day or so, because bitcoin hasn't exactly crashed since it dipped below $7000. At the moment its holding steady, more or less.
As to why it happened, I just think there's been a lot of selling by hodlers who got impatient with the market and perhaps got scared when bitcoin started to dip and then sold in a panic. That's a noob mistake, but a common one. I won't be selling a single satoshi, tho. Bitcoin will probably have a great year in 2020 and I'm hoping that it gets back to $10,000 at least.