[He's about to launch into something along the lines of 'does it matter how long you've known someone if you mean a lot to them', blah blah blah, so on and so forth. But then she asks that, and Newt stares for a moment, looking just as puzzled as she had been by his own inquiry.
After a moment and an owlish blink, he says, very matter-of-factly:]
no subject
After a moment and an owlish blink, he says, very matter-of-factly:]
Well...! Because. I love you guys.
And I want you both to be happy.
[Does there need to be any other reason?]