Two outsiders
Scorpio and Aquarius often recognize something in each other: a refusal to be like everyone else. Scorpio is the outsider who sees what people hide, and Aquarius the outsider who questions why we do it this way at all. Both can tolerate being disliked, which is rarer than it sounds. The talk tends to go to strange places, and each respects that the other won’t pretend to agree.
Depth against distance
What they want from a partner is very different, though. Scorpio wants one person who knows everything. Aquarius wants a partner who’s also a free person, with their own friends and their own life. When Scorpio moves closer, Aquarius feels a pressure they want to step back from. When Aquarius steps back, Scorpio starts to suspect something, then moves closer, or punishes the distance by withdrawing.
Since both are fixed signs, the same fight can be repeated for years without either changing position. The temperature is the odd part. Scorpio burns, Aquarius goes icy and rational, and the calmer one sounds, the more furious the other gets.
Finding the door
Define a few things plainly. How much time alone? Which friendships are fine? What’s private? Written down, these can seem silly, but both of you actually care about keeping your word. Aquarius can try staying in the room for the feeling, without solving it. Scorpio can test this idea: that a person who’s free to leave and doesn’t is giving you more than someone who’s held there.
Note that a close Sun square isn’t guaranteed just because the signs are square, since a late Scorpio and an early Aquarius can be well outside any useful range. See what your real aspects are, and start with something like Sun square Moon if it’s in your report.