He went from long texts to one word replies suddenly

When someone goes from paragraphs to 'k' or 'yeah', they're not engaged. This can mean a few things. He might be stressed about work or life and doesn't have bandwidth. He might be unsure about you and decided to cool it. He might be talking to someone else. Or he sensed some kind of rejection or change in your energy and mirrored it back. The one-word reply is still a reply though, which means the door isn't closed. He hasn't ghosted. He's just not putting in effort.

The timing matters. If this happened overnight after you two were texting heavily, something triggered it. A bad date, something you said, a shift in his circumstances. If it's been building gradually over days, he's more likely losing momentum or interest. Either way, your next move determines if this snaps back or continues to slide.

Don't interrogate the shift. Don't ask if he's okay or if you did something wrong. That puts him in a position where he has to explain himself, and most guys won't. Instead, send something that requires a real answer from him. Ask him an open question about something he cares about, reference something specific he told you, or propose a concrete plan. The goal is to make him actually think and respond, not just reflexively type 'k'.

Alternatively, you can name the shift lightly and without blame. Something that acknowledges it without making it a bigger thing than it is. This only works if you keep the tone casual and curious, not accusatory. The point is to either snap him back into engagement or give him an opening to be honest about what's happening. A good reply does one of these two things clearly.

One-word reply does not mean he's ghosting. It means he's checked out of this particular conversation thread. Send your reactivation text and then wait. If he responds with another one-word reply, or doesn't respond at all within 24 hours, then you know something real has shifted.

If he ghosts your reactivation attempt, do not send another text for at least three days. If he comes back after that gap, the momentum has reset and you can start fresh. If a week passes with nothing, he's gone and it's time to move on. Don't keep texting someone who isn't meeting you halfway. One reactivation attempt is enough. After that, you're chasing.