Why do people bring up exes to someone else they talk too?

The reason I'm asking is cause I just had a random encounter on snap, some chick that lives in the same city followed me, we had a back and forth conversation about passions (mine specifically) cause when I asked hers she just said "other stuff" I tried to end the conversation after I tried to keep it going and she failed to do so then she said her stupid ex didn't wanna fuck her and send me a picture of herself, complete stranger by the way, I just ignored her ass and left her on read Y'all see what I'm dealing with here smh πŸ’€

Show of hands... is this marriage material? πŸ˜‚
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Why do people bring up exes to someone else they talk too?
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