What makes a rebound relationship end?

StarGirl80
For those who were in a serious relationship and then had a rebound, why did it end?

Was it because the "honeymoon" stage was over, and you realized this person wasn't for you? Was it because you got over you ex, and realized that you didn't need your rebound anymore?

Also, how did you explain to them that you wanted it to end?
What makes a rebound relationship end?
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