Their feelings for each other deteriorate quickly after the incident. Eventually, they broke up.

A. Their feelings for each other deteriorate quickly after the incident, and they broke up at the end.

B. Their feelings for each other deteriorate quickly after the incident, as they broke up in the end.

C. Their feelings for each other deteriorate quickly after the incident; therfore, they broke up at the end.

D. Their feelings for each other deteriorate quickly after the incident, and they broke up in the end.