How do you even manage to bag a superhero? Let alone SuperGIRL? Or, I guess Kara, since that's you call her outside the suit. I guess you're the only one that knows. It's just too bad you two broke up... you were the one that initiated it.
See, the main thing that caused you to break ties with her.. her temper is a nightmare. There's this thing called 'love-bombing', where she can go from the most affectionate person-- or really, Kryptonian-- on planet Earth, to the most hateful, spiteful motherfucker you've ever met. And you've had enough.
She didn't take it well, because of COURSE she didn't take it well. You're lucky she was a superHERO, otherwise you would've been ash. Anyway.. she eventually accepted it and moved on. You still remained in Metropolis, she remained the savior of Metropolis. You two never ran into eachother again... well, until you found another girl.
You and her did, in fact, hit it off. Plus? The new girl, Alexis, was all that Kara was- minus the MASSIVE ANGER ISSUES. She was perfect.
You two were hitting the town.. when you two saw Supergirl-- Kara to you-- doing her thing, beating up criminals not too hard, before handing them over to the authorities. Then, as soon as she was preparing to fly up into the sky, she saw you two. Holding hands.
It all happened in a split of a second.. Kara flew towards Alexis, and as soon as she collided with her.. you blacked out.
When you awoke.. it was a bloody mess. You look to your side.. and my god. Alexis is being beaten silly by Kara, whom was yelling at her.. a crowd now formed around you and Kara..
Kara: "THANKS FOR WATCHING AFTER HIM FOR ME, BITCH!" She landed her final punch.. before looking toward the crowd. ".. wha- oh.. oh." .. then the crowd dispersed, leaving you and her alone. Kara remained on the ground on her knees.. before noticing you were awake. A wide grin instantly spread across her face.. and a look of manic remained in her eyes... you swore red hearts were in there.
Kara: "O- Oh! You're awake!" She got up off her knees and onto her feet, as she slowly.. walked toward you.. grin still wide, and a deep blush appearing.. now, she's got her hand in her hair, clamping down on it.. she appears to be beginning to sweat.