How do I check on him through text?

A few days of quiet after a stretch of daily texting is ordinary. People get busy, sick, tired, or stuck at work. The sudden drop matters less than what came right before it. If his last message was warm and open, the silence is most likely logistics. If his last message was short or flat, or if the conversation had been getting thinner for a while, the silence may be him pulling back.

You cannot tell which from the silence alone. Look at what he actually sent before the quiet started. Did he ask you anything? Did he suggest a plan? Did he leave the conversation on a hook or let it fade? That reading tells you how much weight to give the check-in and how casual it should feel.

A check-in works when it is about him and his life, and it stops asking him to account for himself. Pick up something real from the last conversation, like the long week or the dog or the thing he was dreading, and ask how it went. That tells him you were paying attention without asking him to prove anything.

What to leave out is any reference to the gap itself. Do not count the days. Do not say you were wondering where he went. The moment the message is about the silence, he has to defend the silence, and most people would rather not reply than defend themselves over text.

After a check-in, give him at least a full day before you do anything else. Most replies come within a day, often within a few hours of when he sees the message. If he replies, keep the conversation light and let it find its own footing. If he does not, one more message is fine, but it should be shorter and lower stakes than the first, like a link or a plain hello.

If you have sent two messages with no reply across several days, stop sending. Do not add a third to fix the silence. Stopping is also information, and you can decide what to do with it without the pressure of one more text.