Where does “愛している” come from?

愛している (Japanese) comes from Japanese 愛, from Old Japanese な, from Old Japanese の, from Middle Chinese 能 — talent, ability.

愛している (Japanese): I'm in love with you; I love you

Definitions

  1. I'm in love with you; I love you

Ancestry of “愛している”, step by step

愛している traces back through 3 separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japaneselove; affection; tenderness
2Old Japaneseany sharp and thin cutting implement: a blade,...
3Old Japaneseplain, field
4Middle Chinesetalent, ability

via Japanese いる

StepLanguageWordMeaning
1Japaneseいるto exist, to be
2Old Japaneseいる

via Japanese して

StepLanguageWordMeaning
1Japaneseしてand then, so then; 仕手 performer; by
Every word from Middle Chinese