A text with no emoji isn’t a threat. It’s just a text. Your anxiety is adding the soundtrack.

Plain text has no tone, so something has to supply one, and when you are anxious the supply comes from the worst option available. A full stop becomes coldness, a short reply becomes anger, and none of that was in the message. The other person was probably walking, busy, or simply not somebody who uses emoji. The soundtrack is yours.

Check the simplest explanation first this week and ask whether they have ever written any other way. If the worry will not settle, ask them directly and lightly rather than rereading it forty more times. Rereading never adds information and it does raise the volume.