のことばかり

nothing but …

→ の
phrase Rare #20,880
nothing but … Follows a noun or pronoun to show that someone is focused on or concerned with only that thing. With 考える, it means “think about nothing but ….”
JA: 彼は仕事のことばかり考えている。
EN: He thinks about nothing but work.

誰もかれもてめえのことばかりだ

Everyone's only thinking about themselves.

— 羅生門 (1950)

己のことばかり考える奴は己をも滅ぼす奴だ!

Someone who thinks only of themselves will destroy themselves too!

— 七人の侍 (1954)

お母様はお金のことばかり

Your mother is always going on about money.

— 紅夢 (1991)

カールはお金のことばかり。

Karl only ever thinks about money.