Signs The Ex Will Come Back

We've all seen it sometimes ex's come back a week after the breakup, sometimes it takes months or even years. People do get back together. I've never experienced it til now, so I am curious if there are certain signs that are common in breakups that shows if there is a possible future?

Tons of factors such as what type of breakup, rebound relationships, hating each other for a while, having a civil breakup and let each other go, remaining friends etc. Which are more likely to cause someone to come back?
Updates:
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Don't direct answers at me. I am in this situation, but not looking for advice. Just curious if there are common factors that tend to leave a reunion more likely.
Signs The Ex Will Come Back
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