Please help out with this

Hi teachers. Please help me out with this.

Dad comes home to find his daughter crying.

Dad: What's wrong, Harper?

Daughter: Sean (a fictional teenage idol) and his girlfriend broke up. He looked so happy with her. It's just really sad.

Dad: I understand. But then let's hope he finds a new girlfriend soon.

Daughter: No. I don't want him to find anyone else. They were perfect for each other.

Dad: Okay. Then let's just hope they get back together, okay?

- Is this natural English?

- In the dad's second dialogue, is it more natural to say "...he'll find..." instead?

- In the dad's third dialogue, is the "just" appropriate?

- In the dad's third dialogue, is it more natural to say "Let's just hope they get back together then, okay?" instead?