〜ばかりに

Meaning

Expresses that an undesirable result was brought about solely because of that one thing. Used with a feeling of regret that a single cause led to a bad situation. It is followed by an unfavorable outcome.

Examples

一言よけいなことを言ったばかりに、彼を怒らせてしまった Just because I said one careless thing, I ended up angering him.
準備を怠ったばかりに、試合に負けた Simply because we neglected preparation, we lost the match.
保証人になったばかりに、多額の借金を背負うことになった Just because I became a guarantor, I ended up burdened with a large debt.