At that moment, Mila Carlysle finally spoke up, "Prince Finn Lewis, I wonder if you can now tell me what you are really looking for."
Mila didn't ask Finn about other matters, such as the size of the fleet, suggesting there was more than one spy. Simply letting the news that Mila had seen Finn get out would have been enough, but Mila didn't ask anything like that. He also knew that wasn't what Finn cared about at all. If Finn had truly been afraid of such a thing, he probably would have clarified it with him much earlier.
And he wouldn't have allowed him to bring such a large fleet over.
It was just to prevent their conversation from being known, as for the meeting itself, it didn't matter if outsiders were aware.
"Actually, it's quite simple. I have only one purpose, and that is to forge an alliance with the Kalista Family instead of the Rochefort Clan," Finn stated matter-of-factly.