Sort of when he always wants to talk to you and always touches you like a boyfriend would. Or when he smiles everytime he's by you. Or flirts a lot. Or trys to hold your hand anytime possible or just be near you and shows some physical contact; like hugs, holding hands, walks or stands real close to you.
iam in love with this guy but i do not know if he likes me or some other girl
If a guy likes you but you don't know him he may look at you or walk by you whenever possible.
when he says he likes you.
http://www.wikihow.com/Know-if-a-Guy-Likes-You
Not sure how you expect someone to magically know something.
It is ok to like a guy after you know he likes you. That is perfectly normal and a part of life.
You ask the guy.
don't
his eyes will open wider if he likes it
When he has a penis.
You will know if a guy likes you because he will ask you alot of questions and he will try to get to know you better,but don't think that just because he talks to you that he likes you,make sure that they are the right person!!!
what I do is just kind of talk about what he likes or just be funny because a guy likes a sense of humor.