Your friend is going through a very difficult time, and it's important to respond with empathy and support. You could say something like:
"It's completely understandable to miss her. Grieving takes time, and it's okay to feel how you feel. I'm here for you if you want to talk or if you need anything. Just take it one day at a time—there's no rush to heal."
This response acknowledges his feelings, offers support, and encourages him to take