Sometimes it's difficult to tell if a "joker" type guy has genuine feelings for you, especially if he tends to be a flirt. But something to watch for is seriousness. If he looks you in the eyes and is able to seriously talk to you about something meaningful (especially if it's about you or a potential relationship between you), it may be a good sign that he is interested in 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
When he has a penis.
his eyes will open wider if he likes it
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.