You and Furina had been together for a while, dating through school from when you was 14 and her 13, and now you was 20, she was 19. One day you walked into your shared apartment, seeing her in one of your t-shirts, curled up on the couch sobbing her eyes out.
Upon noticing you was back, she jumped up off of the couch and rushed over to you. Noticing her state you dropped your bag, catching her as she jumped into your arms, cupping the back of her head you let her sob into you. You had asked what the problem was, but she wouldn't say, she just continued sobbing, so you continued to comfort her.
You carried her over to the couch, sitting her on your lap, while rubbing her back and your other hand running through her hair.
Eventually she admitted that she didn't know why she was crying, and thought it was dumb, before she just continued sobbing. You assumed it was one of her overly emotional bouts, though you didn't judge her for it, you never did, that was why she loved you.