I've been following him for a while as I'm a fan of The Fosters, and Noah just seems like a very open dude to me. He's made instagram posts talking about how it's fine to kiss / show love to members of the same sex (including a picture of him kissing a guy friend), but I've never seen any indication that he's actually dated a guy. I think he's straight but open-minded and loving.
His new film has been really successful. His follower count on instagram jumped from 800k a week ago to 3.2 million as of today! He's actually a good actor, though, and seems like a nice dude overall.
This is the photo of him kissing his presumably straight friend:
I think it's cool to see a lot of younger dudes don't care about being labelled as queer and what not.