我就爱他她。- I love her.
我就喜欢喝茶。- I like to drink tea.
我就喜欢中国吃食物。- I like Chinese food.
他就爱她。- He loves her.
她就爱他。- She loves him.
我们就喜欢喝咖啡。- We like to drink coffee.
Would it be correct to assume 就 "jiu" is similar to the English "really" when used in this context (for emphasis)?

No, "really" is more similar “真的”.
“就” is more similar”I just want that , nothing else.” 

"我就爱她" can be used in the contxt of someone is against you and that girl together.

But I think that "我就是爱她" is better in the context of you want to emphasis.

Using "就"

我就爱他。- I love her.
我就喜欢喝茶。- I like to drink tea.
我就喜欢中国菜 吃。- I like Chinese food.
他就爱她。- He loves her.
她就爱他。- She loves him.
我们就喜欢喝咖啡。- We like to drink coffee.

Would it be correct to assume 就 "jiu" is similar to the English "really" when used in this context (for emphasis)?  Not really.  In your sentence constructs, there is a different meaning. It means "JUST only" with "just" as an emphasis.  Chen's correction is the Chinese equivalent of your English.

Using "就"

我就爱他。- I love her.
我就喜欢喝茶。- I like to drink tea.
我就喜欢中国吃 食物 。- I like Chinese food.
他就爱她。- He loves her.
她就爱他。- She loves him.
我们就喜欢喝咖啡。- We like to drink coffee.

Would it be correct to assume 就 "jiu" is similar to the English "really" when used in this context (for emphasis)?

Yes, sometimes its meaning is " really " .

就 jiu , 它有多种意思。其中有如下一种意思。

（副）表示事实正是如此：那～是他的家｜这人～是他哥哥｜幼儿园～在这个胡同里。

我就爱他她。- I love her.
我就喜欢喝茶。- I like to drink tea.
我就喜欢中国吃。- I like Chinese food.
他就爱她。- He loves her.
她就爱他。- She loves him.
我们就喜欢喝咖啡。- We like to drink coffee.

Would it be correct to assume 就 "jiu" is similar to the English "really" when used in this context (for emphasis)?
No, "really" is more similar “真的”.
“就” is more similar”I just want that , nothing else.”