Variety Film and Television: When Time Travels and Becomes the Male Protagonist's Ex-Girlfriend

When the male protagonist has an ex-girlfriend and still misses her, can the original female protagonist be with the male protagonist? (It is necessary for the male protagonist to break up with his ex-girlfriend, and the misunderstanding will be solved later. Our female protagonist is a big heroine, has her own career, and will not revolve around the male protagonist. The female protagonist traveled through time when she was a child, not later, so the female protagonist is the ex-girlfriend of the male protagonist, and there is no such thing as substitution)