行くつもりだった

was planning to go

→ 行く
phrase Rare #24,783
was planning to go Expresses a past intention or plan to go, often implying that the person ultimately did not go.
JA: 週末に京都へ行くつもりだった。
EN: I was planning to go to Kyoto over the weekend.

彼女は入院中のお母さんのお見舞い行くつもりだったんじゃないかな

I think she was planning to visit her mother in the hospital.

彼女は入院中のお母さんの見舞いに行くつもりだったんです

She was planning to visit her mother in the hospital.

行くつもりだったのに忘れてたんだ

I was planning to go, but I forgot.

私は彼と行くつもりだった

I was planning to go with him.

トムって誰と泳ぎ行くつもりだった

Who was Tom planning to go swimming with?

私は行くつもりだった忘れた

I meant to go, but I forgot.

他に行くつもりだったんだ

I was planning to go somewhere else.

— ロシアン・ブラザー (1997)

行くつもりだった

I was planning to go.