To end up being with 〜ことになる
Grammar: Time & Sequence » Starting / finishing / completing actions
Appending ことになる to a clause gives the meaning that the clause came to be. The focus is on the result that came to be.
While this grammar is stating that a situation came to be, when the clause ends in a verb it’s often translated in English as a “decision” having been made.
If the speaker alone is the one deciding to do the action of the clause, 〜ことにする is used.
Further Reading
- ことになる/する & ようになる/する (maggiesensei.com)
