Most Helpful Guy
He explained the reasons to you as you said, having a cold, working overtime, and having to visit his parents, and he was just worn. When we are in the beginning of a relationship we text a lot, but as time goes on we don't text quite as much typically. This does not mean we don't love you! Texting is more of a random thing to most guys, not something that if we don't do constantly the relationship will fail!
There was an article Someone on this site shared, while the writer is NOT 100% on everything she did have some interesting things to say about texts. For instance in situations like the one you described:
"Sadly, a lot of relationships collapse before they even get off the ground because the girl can’t handle the sudden decrease in daily texts and instead of dealing with it, she lashes out at the guy and demands explanations for every text he doesn’t reply to. The mistake that many make is thinking that the sudden drop in texts means he’s losing interest or doesn’t care. That’s not usually the case, though. Most often, he’s just settling back into his normal routine."
This part is quite accurate and I couldn't have put it better myself.