Without body language, you can't see someone lean in or make eye contact. But interest still leaves traces — you just have to know where to look.
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They remember what you said.
Referencing something from earlier in the conversation — or even a previous chat — means they were actually listening. Memory is one of the clearest signals of genuine interest.
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They initiate topics, not just answers.
If someone only answers your questions but never introduces a new topic themselves, they're being polite. When they start bringing their own threads into the conversation, they want it to continue.
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They tell you things they didn't have to.
Volunteering personal information — "by the way, this thing happened to me today" — means they want you to know them. You can't fake the impulse to share.
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They don't want the chat to end.
Stretching the conversation with "one more thing" or "before you go" is the clearest sign. When someone doesn't want to stop talking to you — that's real. Find that on Chatrio.