Enable Read Receipts as usual. You’ll find them under Settings, Account, then Privacy.
Should you want to fake out of a conversation, enable Airplane mode. And you can jump back into the chat to read the mass of messages you’ve been sent - without the ticks flashing blue to give away your acknowledgement.
There are limitations to the hack of course. You have to be out of the chat when you receive those messages and then switch to Airplane mode when you want to read the messages without being seen.
Once you reconnect to Wi-fi, your presence will be given away. So have your replies prepped before that happens.
It’s a bit of long winding road, but you might appreciate having this knowledge handy the next time you’re mulling over how to reply a message. You got to take what little you can get, especially in the case of a controlling partner.