и думал

did think

→ и
phrase Rare #36,205
did think Here и adds emphasis and is often not translated directly.
RU: Я об этом и думал.
EN: That's exactly what I was thinking.

Он только о ней и думал.

He thought only about her.

С тех пор только о ней и думал.

Since then I've only thought about her.

— Мальчик и птица (2023)

Я именно об этом и думал.

That's exactly what I was thinking.

Похоже, именно так он и думал.

It seems that's exactly what he thought.

— Орган геноцида (2017)

Том только о Мэри и думал.

Tom thought only about Mary.

Я об этом и думал.

That's exactly what I was thinking.