Are you looking for a way to support your partner or to share with your partner that you need time to think?
If you just need to validate your partner I think SET would be the best. Perhaps a way to engage it without having to say the same thing over and over is to ask questions, such as "How does that make you feel?" or "Can you explain that to me more?"
If you are needing to ask for a little space, then using DEARMAN might help. This is a way to ask for something you need in a way that is sympathetic but honest.
DEARMAN
https://bpdfamily.com/message_board/index.php?topic=160566.0