They try to talk to you all the time.
They enjoy your company and conversation so much. This is why they try to talk to you as much as possible. They are also secretly hoping that you would realize the same thing about them.
They make you feel nostalgic about the past.
Nostalgia is a potent tool, and they know this. This is precisely why they will make an effort to make you feel nostalgic about your past. Once they can arouse that nostalgia out of you, they know that they have a good chance of getting you to like them again.
They ask you about your current relationship status.
Obviously, they are trying to see if they have a shot at getting back with you again. They know that they have higher chances of getting back with you if you’re single and aren’t involved with anyone else. They are essentially sizing you up by asking you this question.
They make an effort to hang out with you.
Besides just talking to you a lot, they will try to make a serious effort to hang out with you as often as possible. They want to spend time with you because they enjoy your company.
They ask you if you’re willing to get back together.
Lastly, some exes will outright ask you if you’re interested in getting back together with them. They won’t hide their feelings for you.
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