There are friends and then there are "friends". Bonds are formed with some that aren't with others. You relate with some in ways that you don't with others - but they're all "friends".
Some people stimulate and challenge you intellectually and spiritually. Some can be relied on for emotional support to laugh and cry with you. Others are great in a more "surface" kind of way.
Some people you just click with and become like Anne used to remark about her relationship with her friend Rachel ....... kindred spirits or bosom friends.
Some people you meet and click with instantly. Others, relationship is built and established over time.
I love the topic of friendship and find it really interesting how people connect and interact with one another.