have a crush on someone 暗恋某人；爱上某人；迷恋上某人

【例句】
Oh, and I did have a crush on someone then, and according to Facebook he's married to someone now who isn't me.
我的确喜欢过一个人，然而从他的脸谱网来看，他结婚的对象却不是我！ 　　

I have a crush on you in junior high school. 　　
上初中那会儿有段时间我特别喜欢你。