You read a message, meant to answer, and forgot. A few days later, replying feels awkward, so you put it off again. You can answer the message without first finding a perfect explanation for the delay.
Answer what they actually said
For a casual message, you may be able to pick up where you left off. If you left your friend waiting on a plan or something important, acknowledge that and answer it. You could say, “I’m sorry I left your news unanswered. How did your first week go?”
Read the message again before replying. They might have asked a question, shared news, or needed an answer by a particular day. Respond to that instead of starting an unrelated conversation to dodge the unfinished one.
Notice whether you left them waiting on something
A casual update, a time-sensitive invitation, and a vulnerable message may call for different replies. Research on messaging expectations suggests urgency and previous reply patterns matter; there is no single deadline that tells you how your friend feels.
If your silence disrupted a plan, acknowledge the inconvenience, help arrange what happens next, and follow through. If they were hurt, listen to what bothered them before explaining your intentions.
Make future replies manageable
A short answer is allowed. You can say you cannot make dinner before you have time to catch up properly. If you need longer to respond to something important, tell them when you expect to be able to talk.
Avoid promising that you will never miss a message again. If this happens often, discuss what works for both of you, such as calling for time-sensitive plans. Then let this conversation continue without apologising for the same delay in every message.