Knowing if someone is lying face-to-face may not be difficult, but as this form of communication seems to be out of use in the current age of technology, it may be helpful to learn to understand when someone is lying in a text message, or in a message. any type of written message.
Steps

Step 1. If the person replies after a long time despite replying to your text messages immediately and chatting without stopping in the previous 10 minutes, maybe something is wrong

Step 2. If he responds with a long, nonsensical explanation, he may be trying to avoid telling the truth

Step 3. If you change the subject right away, maybe you just told a lie

Step 4. If you are suspicious of this, keep the matter in mind and ask questions when you get the chance
You are the interlocutor in this conversation and are responsible for asking questions.