ことばかり考えている

think of nothing but

→ こと
phrase Rare #35,718
think of nothing but Used to emphasize that someone is constantly thinking about one particular person or thing, often with the sense of “all they think about is ...”.
JA: 最近、旅行のことばかり考えている。
EN: Lately, I can think of nothing but traveling.

ひとりのときは彼のことばかり考えている

Whenever I'm alone, all I think about is him.

彼は彼女に会うことばかり考えている

All he thinks about is seeing her.

私の妻は掃除ことばかり考えている

My wife thinks about nothing but cleaning.

彼女はいつも男の子ことばかり考えている

She’s always thinking about boys.

僕は君のことばかり考えている

I can’t stop thinking about you.