He has a crush on a girl in our class.

他暗恋我们班上的一个女生。

单词:crush 迷恋

短语：has a crush on(someone)暗恋(某人)

2.Because you,my life is filled with hope.

因为有你,我的生命充满了希望.

3.Love is blind.

爱情令人盲目.

单词:blind adj.盲目的.

4.You can turn me down,but don’t lie to me.

你可以拒绝我,但不可以骗我。

5.It would be better for us to be friends rather than lovers.

我们还是做朋友比较好。

6.Who is his mistress?

谁是他的外遇对象?

单词:mistress n.情妇

短语:have an affair with someone 感情出轨

the third party 第三者

7.Love is a lifetime of trouble.

爱情是一辈子的烦恼。

单词:lifetime n.一生;终生

8.What is my place in your heart?

Do I have a place in your heart?

我在你心里排第几位?

9.I regret everything I’ve done.

我后悔我所做的一切。

10.My heart is broken.

我心碎了

或 My heart has started to wither.我的心开始枯萎了.(比较古老但富有诗意的说法)