I wouldn't say one word...he knows that something is up. Just let him stew. Unless the texts are important or about your child/bills, you do not need to respond to every text he sends. Also, I would consider waiting a while before responding to his texts. If he asks what took you so long to respond, say "I have been busy".
When in doubt, do absolutely nothing.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
