If the guy you are interested in turns to you for advice on relationships, it isn't likely that he wants to pursue anything romantic with you, especially if he gets specific with the details.
When you are hanging out with a guy and you notice that he is constantly looking at other girls and checking them out, then it is probably because he isn't interested in you. When a guy is truly into a girl, it will seem like she is the only person in the universe to him.
If you have attempted before to discuss your true feelings to the object of your affection, only to realize that he keeps trying to change the subject and alter the direction of the conversation, it is probably because he isn't very comfortable or open to the idea of discussing romance with you. This is almost a surefire sign that you are in his "friend zone."
Forgets You Exist
If a guy seems to forget that you exist when he is dating another girl, no matter how casual the situation is, then you are not on his mind and he only thinks of you as a friend. Be careful with these kind of "friends." If a guy forgets you exist entirely when someone new is involved, he may just be using you for some opposite-sex attention when he is bored and restless.
If you detect absolutely no flirtation or sexual tension on his part, then your spot in the "friend zone" is likely permanent. When a guy is attracted to a girl, whether he is aware of it or not, he sends signals of flirtation, including mimicking her gestures and motions, extended eye contact, "accidental" touching and pointing his body and feet toward you. If you wear something revealing, pay attention to his reaction. If he doesn't even try to sneak a look in, he simply doesn't care.
If his mother or friends suggest that the two of you become a couple and he finds the notion to be absolutely hilarious, then it is pretty evident that he only wants to be your friend.
If a guy friend expresses an interest in one of your friends and asks you to set up a date with her, then he definitely only wants to be your friend. If he doesn't even suspect that the idea makes you feel bad or jealous, then you are surely in the "friend zone" with him.