So I have like this guy for a while, but I don't know what to do about it. He is my best friend's brother, and my brother's best friend. I asked him on a date earlier this month and it was great, but he's really shy, and so am I, so I still don't think he knows I like him, and I have no idea what he thinks about me. Should I say anything to him?

Well, if you guys went on a date, then obviously he has some feelings for you, friends or simply more than friends. And if both of you are shy, if showing that you can come out of your shell and confess means that it inspires him to do the same and doesn't feel very uncomfortable, then you will see if he likes you more than a friend as well. Than if not, oh well, its better to be friends than nothing right?

If you don't tell him, you won't know what could have happened, if you could have had a great relationship with him. You don't want to wonder if you guys could have gotten together. SInce you're shy, I get why it's hard for you to tell him, but you can't find out how he feels about you unless you tell him how you feel. Hope this helps! I encourage you to tell him.

You can't see how far you can throw a ball unless you pick the ball up! It's not going to throw itself just by you looking at it!

(do you get what I'm trying to say?)

I would mention how much you enjoyed being with him when you both went out, and hope he feels the same. Then give him time to answer, if he states that he did have a good time, see if he would like to go out again.
Good luck

I would say nothing, but would keep having fun together, and enjoy each others company.