Why start a conversation only to leave me on read and no response

You said something wrong or creepy or the person is thinking about how to reply. They read your message by mistake when they’re heading out and didn’t have time to answer yet.

Happens a lot here, people reach out, act like they care and want to help you, start chatting than ghost you and never answer you back

Did they know you were trying to help them?

Maybe you said something they didn't like.