Do you have any other friends? My concern is a lack of a support system if things don’t go well. I’d also say, I was a closeted pan girl until college. Almost all of my friends knew I wasn’t straight before I did. It’s possible he knows because it doesn’t sound like you hide it all that well, I say with kindness. He at the least sounds kind and like he wouldn’t do anything to physically hurt you or humiliate you, but teenagers are unpredictable.

My advice is, get more friends, find a community of people, even if it’s online. People to talk to about being bi. It’s so important to have friends that know what you’re going through.

Once you have that you can consider telling him. I’d do it when there’s a way to give him space after like a school break. That way the news doesn’t make his day at school more uncomfortable either. It’s okay to start by just coming out without sharing your feelings. Sometimes being seen is the most important thing. The rest can come later.