One unanswered message is not a crisis, and one smart follow-up can absolutely save a conversation. The problem is never the double text itself, it is a needy one like hello?? or did I do something wrong.
The rule: wait at least a day, then send something new and light. Add value, never demand a reply.
A follow-up an hour later screams anxiety. After a day it reads as relaxed and busy, which is exactly the energy you want.
Never reference the ignored message. Start a fresh thread with a new hook so they can reply without awkwardness.
If two unanswered messages get nothing, put the phone down. A third only lowers your value and makes a comeback less likely.
Yes. One light follow-up after a day or so is normal and often works. What fails is rapid-fire messages or guilt trips about being ignored.
At least 24 hours is a safe rule. It gives them room to reply on their own and makes your follow-up feel casual instead of anxious.
Something new and easy to answer: a funny observation, a light question, or a callback to a joke. Never why are you ignoring me.