When you get to the option to let the boys go or not, follow this route:
(If you come across this option whilst romancing someone, save, and either come back to this, or do this, and then go back to the previous route you were taking)
- Let the boys go
- Make a deal with Diana
- Her
- Yes
- Yes
- I'll Stay
- That's enough, Diana
- Take her hand
- You shouldn't have to marry someone you don't love
- I'm not
- Run
- Don't