@omegaxis1:
I mean, the way I saw it, the problem wasn't that the kid is suspicious of her (which is totally reasonable, the circumstances do beg many questions), but that he shouted his suspicions at the top of his lungs (which is childish, and rude—and, heck, if she were the sort of schemer he suspects her to be, would also be incredibly foolhardy and dangerous).
In almost no circumstance is continuously shooting off his mouth here like this, the adult thing to do.
That said, he seems to be acting like a fairly normal teenage boy. An actual one, I mean—a slightly greasy, whiny, brash fool of a half-formed adult; rather than the rosy-eyed depiction we'd normally expect from this genre. XD