老师：

Best friends are loyal and reliable.

A best friend is a person who you can tell your most embarrassing personal secrets to. She/He won't repeat your secrets to anyone else.

Best friends can also be completely honest with you, but in the most gentle way.

Finally, best friends are the family you choose. They love because they want to, not because they have to. For many people, a best friend

becomes the brother or sister they'd always wanted but never had.

请教老师：

1） but in the most gentle way. 根据前后文，怎么理解意思呢？感觉不通顺

2） they'd always wanted but never had. - 为什么使用过去完成时they'd always wanted 呢？不理解？

谢谢。