3 sentences

1. 他这人太矫情，总为一点小事争个不停。

   tā zhè rén tài jiáo​qing, zǒng wèi yī​diǎn xiǎo​shì zhēng gè bù​tíng.

   He is too difficult; he always argues over the smallest things.

   Source: Dong Chinese Dictionary

2. 既然大家都已经决定了，你就别再矫情了。

   jì​rán dà​jiā dōu yǐ​jīng jué​dìng le, nǐ jiù bié zài jiǎo​qíng le.

   Since everyone has already decided, stop being so difficult.

   Source: Dong Chinese Dictionary

3. 她那副矫情的样儿，看了就让人起鸡皮疙瘩。

   tā nà fù jiǎo​qíng de yàng'er, kàn le jiù ràng rén qǐ jī​pí​gē​da.

   Her affected behavior gives people the creeps.

   Source: Dong Chinese Dictionary