Switch the bravery. For this scene, her love interest is the brave one. As always, create a conflict between them. First draft of a long example:
Marcie heard something, a gasp, and moved to the back of the house. She heard it again, from Lexi's room, and moved to the door. Crying. Muffled crying. It sounded like Lexi. Was she crying? She thought she should walk away, respect her privacy, but the thought of Lexi actually crying was too much. She opened the door and walked in.
Lexi jumped, wiping her eyes. "Get out. Get out of here!"
"You're crying. What happened?"
Lexi wouldn't meet her eyes, she turned her head to the side. "Nothing."
"No, something." Marcie took a slow step toward her.
Lexi stood and faced her, eyes red, then strode to meet her. She raised her voice. "I said, get out!"
Her fists were clenched. She was angry. Marcie felt herself flush, she almost turned and ran, but stood her ground. Her knees felt weak. Her voice trembled. "I won't. You don't cry. So something's really wrong, Lexi. Tell me what's wrong."
Lexi's expression changed, from anger to ... is it sorrow?
"I'm sorry," Lexi said. "I shouldn't scare you." She turned back and sat on the bed, then fell face first into the pillow. She didn't say anything else.
Marcie hesitated, then moved to sit on the bed beside her, and put her hand on Lexi's shoulder, which made Lexi twitch. "Tell me."
Lexi's voice was muffled through the pillow. "I'm afraid. I have to fight Petrovski, and I think he might kill me."
Petrovski. Holy shit. "Wow. That's a really good reason."
Marcie was silent, thinking. Lexi sat up, and looked at her, half amused. "You think so?"
Marcie's hand had fallen to her lap. "Well. I would cry."
Lexi sniffed. "You cry if you spill coffee on yourself."
"Coffee stains, and that was my favorite dress!"
Lexi nodded, and leaned left to gently bump into Marcie, then looked away toward the window. "I know. What do you do when you're afraid?"
Then, however her love interest comforts her, proceed.