My crush found out that I like him, but he likes someone else. He knows that I like him but ignores it and acts like it is all normal. What do I do?

It sounds like he's trying to act normally and not make your friendship awkward, so it's a good idea to assess your own feelings. Are you okay with just being friends, or are your feelings too intense for that? If you don't feel like you can be friends without being sad or jealous, you might want to get some distance from him so you can stop liking him. If you feel like you can just be friends, though, then it's okay to act like you did before he found out you like him. It might feel weird or embarrassing at first, but remember, he feels awkward too, even if he's not showing it!