Do you communicate better with friends, or in a relationship?

Everyone I've met and talked to in relationships, including my own, it seems that it's too tough to talk to the one you love, but to friends you can say almost anything. Shouldn't it be the other way around? Friends are easier to obtain. That's why you likely have many, but someone you love, there's only one (or should be). Why not be more open to them, and less open to friends.

FriendsRelationship