Yea they should only if the need to not to just show off or fit in  

Well it depends on the guy if you and him are friends for a while and he says I love you he probably means it, but if you and him aren't friends he probably doesnt mean it.

Girls r better at everything just say it boys

Well if its all right with the parents yea!!! But some girls might get to serious for the boy so the boy has to be ok with it