关于初中课本中与爱情相关的英语句子，综合整理如下：

一、经典爱情哲理句

1. "Patience is bitter, but its fruit is sweet."（耐性是苦的，但其果实是甜的）

2. "To the world, you may be one person, but to one person, you may be the world."（对世界而言，你只是一个人；对某个人，你是他的整个世界）

3. "Love is like a butterfly. It goes where it pleases and it pleases where it goes."（爱情如蝴蝶，随心而飞，飞到哪里便带来欢乐）

二、情感表达金句

1. "I need him like I need the air to breathe."（我需要他，正如我需要呼吸空气）

2. "Never frown, even when you are sad, because you never know who is falling in love with your smile."（即使伤心也不要皱眉，因为你不知道谁会因你的笑容而坠入爱河）

3. "The flame of dreaming and the moment of dancing, when all the romance is far away, the eternity is always there."（当浪漫远去，梦境与共舞的瞬间永恒存在）

三、爱情真谛感悟

1. "I love you not because of who you are, but because of who I am when I am with you."（我爱你不是因为你本身，而是因为有你在时我的样子）

2. "Love makes man grow up or sink down."（爱情让人成熟或堕落）

3. "Love is not a carefully designed lie, but a choice made with all one's heart."（爱情不是精心设计的谎言，而是全心全意的抉择）

这些句子通过哲理、情感和感悟三个维度展现了爱情的多元面貌，适合初中阶段英语学习者积累写作素材和提升语言表达。