YOU SAID:

I thought my friends would always be there for me but they left when I needed them

INTO JAPANESE

友達はいつも私のためにそこにいると思っていましたが、私が彼らを必要としたときに彼らは去りました

BACK INTO ENGLISH

My friends always thought they were there for me but they left when I needed them

INTO JAPANESE

私の友人はいつも彼らが私のためにそこにいると思っていましたが、私が彼らを必要としたときに彼らは去りました

BACK INTO ENGLISH

My friends always thought they were there for me but they left when I needed them