When people really care and want to be friends, no matter how busy things get, they'll still want to make time for you. If they're always telling you they're tired or busy but they manage time with other friends, they really don't care.
"Worry is like a rocking chair. It will give you something to do, but it won't get you anywhere" <---- um worry is nothing like a rocking chair. Rocking chairs can be fun and relaxing. Worry is more like.