mb, if you are worried about ignoring his texts as coming across as playing games, you can always say "I am only comfortable speaking with you concerning kids or finances. I know you will understand. " and then ignore the silly ones.
I do text my WH ONLY in response to S...but that is all he texts me about anyway!
Ya Newmama you got it... He's playing games with HER, so he thinks everyone's playing games with him. The OW is likley playing games with him too... I believe the popular expression these day is called "Hot and Cold" lol
When you shut him out, make sure he KNOWS WHY. If you give him a full explanation and details of where you are at, its not a game, your cards are on the table.
Since you won't fight with him anymore, which is GOOD, well done there! He's using the phone and the kids as an excuse to get that interaction from you.
Next time he sends a text write back :
YOU'RE HURTING ME
and send it... CAN that message and reply with that to EVERYTHING HE WRITES you...