Learn what "i can't help" means, when people say it, and how to use it naturally in English.

It means the speaker fears an old romance may start again.
From Trial Marriage To A Billionaire Season 2, Episode 31
The speaker admits they are worried the other person might restart a past relationship.
Use this in relationship conversations when you want to admit concern about an ex or old feelings. It sounds emotional and personal, so it is not for casual settings.
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