You are really able to act as anchor for your partner's emotions. They tend to be more emotional than you are; they get stressed out a lot and even fly off the handle from time to time, overreacting to situations that upset them. You are able to help them get onto a more even keel.
Your grounding influence calms them down in times of heightened tension, and you're able to represent different sides of any situation for them, helping them to see why that cashier at the grocery might have spoken sharply to them or why their mother says those discouraging things whenever they call her on the phone. You really understand your partner's emotional side, and you even love them more for it. The way you see it, their emotional response to the world shows that they care, and you're happy to step up and help through through the difficult moments of life. This dynamic also applies to the happier moments of life, as well. Your partner gets all excited about something and your more grounded perspective helps them to stay rooted in reality. That's an important function to learn, for yourselves and for the relationship, and even if this relationship isn't a long-term one, your partner is able to take these skills with them whatever they do next.