A relationship is an everyday struggle, you have to work at it even when you don't feel like it.
How do you know how long you are going to like that person?
It can take a while before you know if a person likes you or you like them. It also depends on how you like them, if it's relationship-wise or just friendship .You can tell by the personality and how they treat you, whether they are nice and how they carry themselves: do they seem too laid back, willing to listen to you?