AIO for being ghosted?

Recently i have patched things up with an ex (both earliy 20s) and both are being friendly and decent towards each other. Over the course of the last 10 days we've texted every day almost all day, although it is a bit unusual for me because I don't really like talking over messages.

Little disclaimer: we are both adults, each with their own chores and tasks and busy days, and i myself am very nonchalant about messages - if you can't reply for hours, days or weeks it's perfectly fine as long as you communicate it, i do the literal same thing because of how full of shit my week is. Messaging is for urgencies and plannings, not necessarily for chit chat.

However, what's bugging me is that in the last few days ex has been replying only a bit in the morning and the evening while talking with other people in the groupchat. It's not that they talk with other people, but the fact that i get ghosted whilst i always apologize/motivate my late replies.

Should i talk to them about it?