Hi Confusedwoman,
There have been other breaks so maybe this is not the last one?
What should I do tomorrow so that I don't overwhelm him, but to possibly have him reconsider not breaking up? I
Do you truly understand why he is feeling to need to do it? Does he feel you truly understand?
If you want to strengthen connection - validate.
If you want to be heard - SET.
Whatever your main messages are - keep them simple and short.
Last but not least keep in mind you have value and are lovable with or without him!