What does it mean when a guy suddenly stops texting you?

The last conversation we had went well. We have been texting daily for months. And every time he doesn't reply or forgets to, he always apologizes and tells the reason. However this time, he wasn't active for 2 whole days. The third day he finally went online but hasn't texted since. Should I be worried?
...…
...…
What does it mean when a guy suddenly stops texting you?
Post Opinion