Have you noticed how your crush sneaks glances at you every time he thinks you're not looking? How he acts differently when you are around?
This means that he's trying to make you comfortable and secure about the fact that you're the only girl he's thinking about.
The reason behind this is that he wants you to believe that you're the only girl he's interested in without telling you explicitly.
He wants to get closer, physically and emotionally. This is because he thinks there's a big chance of something happening between you if you're almost always together.
He shows up whenever you need him to. He will also show up whenever you need a hug, someone to talk to, a shoulder to cry on, etc.
If he does or says things to make you look up to him, it's because he likes you secretly, and he wants you to be impressed with him. He probably sees you as girlfriend material.