Stop reading old messages. The answer isn't in there.
We scroll back. We reread the last conversation. We look for the moment it changed, the sign we missed, the sentence that would explain everything.
It isn't there. The messages are just words that were true for the moment they were sent.
Closure rarely comes from the other person or the old thread. It comes from deciding, one day, that you've read enough.
Turn the phone over. Drink your tea. Look out the window. There's a whole morning happening without that conversation.