Which is worse, a read or unread message?

If you have someone that you talk to primarily through Facebook Messenger or a similar app, which is worse:

Reading a message, not responding to it, and continuing to use the app to talk to other people?

or

Leaving a message as unread and continuing to use the app to talk to other people?
Reading it and not responding
Leaving it as unread
Select gender and age to cast your vote:
Which is worse, a read or unread message?
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