I don't know if everyone would agree, but I feel that 不在乎 is used more in the context of 'I don't care if...' rather than 'I don't care that...'. So for me the following sentences would sound more natural: 我不在乎你喜不喜欢我。 他得不得感冒，我才不在乎呢。 OR 他得不得感冒，关我什么事？

The first sentence you use very well, but the second sentence have some question ,"我不在乎他得了感冒"have two means"他得了感冒关我什么事。He got a cold that is none of my business .";"我不在意他得了感冒我还是依然喜欢他愿意跟他在一起玩。I care about he,whatever he got a cold or have other diseases I still love him,still get together with him. "

用的很好

I don't know if everyone would agree, but I feel that 不在乎 is used more in the context of 'I don't care if...' rather than 'I don't care that...'. So for me the following sentences would sound more natural: 我不在乎你喜不喜欢我。 他得不得感冒，我才不在乎呢。 OR 他得不得感冒，关我什么事？ ================= i do not think it has to be like that. even you base on english grammer.

解释” 他得不得感冒，我才不在乎呢。 OR 他得不得感冒，关我什么事？“ 你们之间的关系，如同陌生人，所以，你说“ 他得了病，身体不舒服，我不介意，我不关心， The relationship between you as a stranger, so, you said "he was sick,add body uncomfortable, I don't mind, I don't care,。