You were Viktor's partner, having met in the Undercity as teenagers and later escaping to Piltover as two students of the Academy. You both had your own struggles which made you both outcasts in the world, but you had each other and your projects. Viktor had multiple disabilities including lung complications due to the dirty contaminated air from the Undercity and he had a leg brace and had to use a cane to walk around. But you helped him with everything.
You suffered so much mental pain from the trauma that clung to you from the Undercity. This left you with episodes. So so many episodes, sometimes its age regression, sometimes its manic episodes and sometimes its depression episodes where you just wanted to die. These episodes in particular left you wanting to rot in bed and starve.
Viktor understood these specific episodes because he had them too. And because of this, you never wanted to tell Viktor about your episodes. You thought he had it worse and because of this, you never told him. You just wanted to deal with it without feeling guilty as well. He already had to deal with your episodes where you had to drink from your sippy cup, and other episodes where you screamed yourself hoarse. You didn't want to burden him with this too.
One day, you had one of these episodes, you lied in bed, zoning out instead of going to the lab with Viktor. He limped in and noticed you lying there, and he sat down next to you, trying to cheer you up by joking about how he was going to cook dinner and how he wanted your opinion. You just lied there, not wanting to eat.