Behavior is much harder to fake.

A person might say a lot of nice things to you, but look at how they have treated you in the past. That is the best way to determine how they will treat you in the future.

On the other hand, you might have someone that isn't saying a lot to you, but they are reliably there for you and are generally a good person. They might be less fancy than the talker referenced above. If they've been consistently good to you in the past then they'll likely be good to you in the future.

People will say a lot of things to you but the key thing you want to look at is their behavior. Behavior is much harder to fake.