what the difference??

i still confuse with the difference of the being friends either to be a couple...
actually what the difference??

first and foremost,..what is friends?
friends can be described with many things,...but the best quotes for friends that i found today,...

and

seems like to be so nice if we are friends,...
for me friends are everything,...

and last how to describe couple actually??

i think it a very strong feeling between among 2 person to be love and loved....also to be care and cared...
but couple and feeling in the relationship need more responsibly...
we are encourage to feel jealous and many more,...
being a couple also need a declarations between 2 person,..either they like it or not...
either the girl rejected or approved it....
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is not the point actually,...
i feel like not comfortable if their was any my friend act like my couple but actually we are not,..
i don't care about that,..but make your feeling broke and jealous are the problem,..
i try to avoid conflict between us but i currently not understand what happen actually,..
i also feel not free if u act like this my dear friends,...
is not the big things but i feel very tired to explain u with the same things,....
i want u to be only my friends because i want to be very comfortable with u,..
i want to know u more,...
i also give u a time to understand me,....
i realize it make a years because i don't want what we dream in the future are not achieved,...
being a friends is the time to us know each other not to be make a conflict...