worried"? You shouldn't WORRY if someone is gay because being gay isn't a bad thing. Also there isn't just gay & straight, there's also bisexual. & why would the way he ate the banana make you wonder about his sexuality? Why not the fact that he's kissed 3 other male you tubers?
That being said:
1. We will not know for sure unless he tells us because, for one, it's none of our business, & two, he is entitled to his own privacy.
2. He has a girlfriend & it's obvious he really likes her, so that rules out the possibility of him being gay. Sure he can still be bisexual, but we wont know until we have any proof.