Very probable Lizz. When Bettas are introduced to a new environment it's all very scary and new to them! Most of them haven't been in anything larger than half a gallon as an adult fish so more space is always frightening for them.
Think of this; you are forced to move to an entirely new country where you don't know the language, you don't have money and you don't have luggage with you. That's pretty stressful and scary, right? That's kind of what your betta is feeling like; it's all so new to him! You just need to give him time to settle in and make his home feel comfortable!
At night, you can put a towel or a blanket over his tank to make it very dark. Take the towel off in the morning before lights on, the total darkness really helps keep fish less stressed and he will settle in quicker ^_^
BTW, I absolutely adore his name! Van Gogh is one of my favorite artists besides Rembrandt and I've got a fishy named Rembrandt! He's in my avatar there ^_^
Wilds: Wajok, Rutilans, Siamentorialis, Hendra
Leopards: Luna, Astrael, Dorian, Cullen, Gallifrey
African Fat Tails: Nox and Lux
Bearded Dragon: Stormfly