有一句话看不懂,关于哈利波特里面的人物的,

题目

有一句话看不懂,关于哈利波特里面的人物的,
Lupin is a wonderful teacher and a very nice man but he has a failing and his failing is that he does like to be liked and that's where he slips up because he has been disliked so often that he's always so pleased to have friends so he cuts them and awful lot of slack.(Lupin是一个人名字)
这段话最后一部分是不是有问题?如果是,有没有英语高手能够看懂它是什么意思?最好能推测一下作者想要写的究竟是什么话?

答案

卢平是个好老师也是个很好的人,但是他在人际交往上很失败,他很渴望被别人喜欢,却总是不能如愿.由于他总是被别人讨厌,所以他很高兴为了交朋友而表现的不那么严厉甚至有些邋邋遢遢.