I have a thing for her. 

我很喜欢她。 Technically means the same but not the same nuance.  我对她有意

Gina has a big crush on Zack. Gina 暗恋 Zack
Gina完全爱上Zack了。

She doesn't usually date guys with huge egos.
她/一般/通常/不约会和跟has an implication to follow自尊心太高 自大的男/孩/儿/ 相約人。

George has zero interest in marrying Sarah at this stage.
最近George 这时沒有意思和对结婚跟Sarah结婚完全没有关心。

最近= recently

关心 = to be concerned, to care about
To be more precise in translation, George 在这阶段时期...
(Don't rush me) I'm still thinking. 我还在想
别催了。现在我想着。= I am thinking now

Don't think too deep. 別想太深
不要太苦闷。 Don't be too /depressed/dejected/ or "don't be feeling too low"


谢谢！

I have a thing for her - 我很喜欢她

你好！


I have a thing for her.
我很喜欢她。

Gina has a big crush on Zack.
Gina完全爱上Zack了。

She doesn't usually date guys with huge egos.
她一般不约会跟自尊心太高的男人约会。

Zeorge has zero interest in marrying Sarah at this stage.
最近现阶段zeorge对结婚跟Sarah结婚完全没有关心一点兴趣也没有。

(Don't rush me) I'm still thinking.
别催了。现在我想着还在想。(still: 仍在,还在) 

Don't think too deep.
不要太苦闷。 (我会想翻成：别想得太深入/太多了...)


谢谢！

**只有一处：do sth with sb. 在中文会变成- [with sb][do sth]和谁做什么 

希望这样表达，您会懂我的意思。

I have a thing for her. 

我很喜欢她(emphasis on the state that I'm in love)。 or 我喜欢/爱上她了（emphasis on the moment I fell in love）

Gina has a big crush on Zack.
Gina完全爱上Zack了。or  Gina完全爱上了Zack   //写得很好！

She doesn't usually date guys with huge egos.
她一般不跟/和自尊心太高的男人约会。  //note the place of '约会'

Zeorge has zero interest in marrying Sarah at this stage.
目前zeorge没有和Sarah结婚的打算。 or zeorge目前没有和Sarah结婚的打算。//note the place of '目前'

(Don't rush me) I'm still thinking.
别催了。我在想。 //accent the sentence on '在'

Don't think too deep.
别想太多 // don't =不要 or 别(informal)