Some ways to find out if someone likes you are that he will hold your hand when talking to you and he will find time to talk or meet you no matter how busy he is. A person who likes you will make an eye contact and put a smiling face.
There are a bunch of ways to come across this. One way is to be bold and just ask him or if your not too young flirt and see if he flirts back. Another is two ask a not-your-closest friend to ask if he does so he doesn't feel like the minute he tells her your going to know. Or maybe spy a little. See if he looks at you a lot or he does nice things for you. And if your old enough see if he is flirting with you