How to Find Out if a Good Friend Is Crushing on You

Steps
1
Notice Differences. Everyone operates differently, so while the following clues can be good hints, the most important indicator is whether or not your friend treats you differently from her or his other friends. Regardless of whether or not your friend treats you worse or better, any difference could be a hint they have a crush.

2
Eye contact. See how long your friend looks you in the eye for. If it's longer than usual, he or she may be looking for something more than friendship. As they say, the eyes are the windows to the soul.
3
Physical contact. Does he or she make excuses for holding on to you, touching your hand, giving you a hug? This is usually a sign that a person wants more than friendship. This shows he or she wants to get closer to you and to hold you when you're both comfortable with it.
4
Facial expressions. If your friend blushes when talking to you, it's a hint that he or she likes you. Just the same for smiling. If he or she smiles at you every time you look over, there's usually something going on.
5
Nervousness. If your friend gets nervous while talking to you, it's a sign that he or she likes you at least a little.
6
Use friends as a clue. If his friends tease him when he's hanging out with you, he's told them something he doesn't want you to know. Which usually means he told them he had feelings for you- or something of the sort. (not always though I am a guy and whenever my friends "tease me" around girls I am talking to it is just on hunches)
7
Cleans up. Does your friend start to look nicer when you two hang out? Perhaps he or she wants to look nice for you and wants to impress you.
8
Teasing. If your friend begins to tease you in a joking manner, he or she might have a crush on you. For example, your friend could be acting sarcastic when he says "nice hair.", but take it as a compliment because he probably means it.

Tips
Ask your friend's closest friend(besides you); they usually know everything about each other.
If you look at your crush and he/she quickly looks away, it means he/she was looking at you!

Warnings
If you find out your friend does like you, don't play with his or her heart. Explain your feelings, whatever they are, and see if it will work out.
If you just want to be friends, don't lead him or her on. Simply say you just want to be friends. If it hurts your friend too much, just let him or her know maybe someday it will work, but it just isn't an option at that time in life.
If they act like they like you, but they've confessed to you that they have a crush on somebody else, perhaps they are confused. Most probably they have feelings for both you and that other person, but they're inclined to admit only the other one as the "official" crush, fearing that admitting their feelings for you will ruin your friendship. Don't approach them directly if you're not 100% positive that they like you; otherwise you may get into an awkward situation.