How do you show someone you care about that you care about them?

There's many reasons:
1. eye contact
2. when you walk around he may brush your shoulder with his.
3. he may ask you question alone or ask when you were born or when your birthday is.
4. he might ask where you live so he can secretly come to your birthday.
5. he push or punch someone who pushed you.
6. he might ask his friends to ask you if you like him. 7. he might be looking at you and when he cacthes you looking at him he may turn away and look embarrassed.
8. he might give you gifts and ask if you will give him some to.
9. he might come over to talk to you and he starts getting embarrassed as you see him come to you and he might turn around and go back.
10. he may hang with your friends.
I hope this is some help.
I have a crush and he knows that I like him cause my friend told him, now I try to avoid looking at him! I have to make sure I am confident with though or else he might dump me when we get together.