I like to understand a sign by looking at the components. Scorpio is a fixed water sign ruled by Pluto (or Mars if you’re a traditional astrologer like me). As such, Scorpios would not be subject to sudden mood swings in the absence of other factors. Therefore, you can assume that whatever emotions led to the attack must have been present for some time, and that the lashing out (Mars) is a reaction to something. If you find out what upset them so much, you will have the opportunity to transform (Pluto) your relationship.