My wife seldom sends me text messages.

There are three reasons. First, because she thinks you don't care about her at all, you can not contact her for a week. She will be sad when she remembers it, and will not reply to you angrily. You calm her down and she will tell you what she is thinking. Second: She is too busy recently to contact you. In this case, it can be said that her mind is not on you. The third type: she is used to not looking at her mobile phone, so she didn't see the text message.