We don’t use a lot of these as we think most are very cheesy and too cute for us. You can hear these terms used all throughout Korean dramas and Kpop songs if you watch/listen to them.
We do have a few nicknames for each other. “Baby girl” (Aaliyah reference) is a favorite for her and she likes calling me “애기” which means baby.
A list of vocabulary in the graphic:
애인 (ae-in) = Sweetheart
연인 (yeon-in) = Couple
여보 (yeo-bo) = Darling/Honey (for married couples)
자기야 (ja-gi-ya) = Baby/Honey
내 사랑 (nae sa-rang) = My love
부부 (bu-bu) = Married couple
여자친구 (여친) (yeo-ja-chin-gu) = Girlfriend
공주님 (gong-ju-nim) = Princess
우리 강아지 (u-ri gang-a-ji) = My puppy
찡찡이 (jjing-jjing-i) = Cute term for a girl who whines
남자친구 (남친) (nam-ja-chin-gu) = Boyfriend
오빠 (o-ppa) = Honey (used to by women towards an older man)
서방님 (seo-bang-nim) = Husband
왕자님 (wang-ja-nim) = Prince
Here is the video for this infographic: