Hi Christin,
Wanting to take things slowly is a natural response to a relationship going at warp speed. You didn’t say “No”. You said, “Yes, perhaps, but can we get married and have kids, a house and a dog in two years rather than two months?” I don’t care if you’ve known each other for three years.
You did nothing wrong.
This bears repeating: You did nothing wrong.
Perhaps it’s a blessing things so easily went south with Mr. Sensitive. It would have been something else if not this, you know.
Best,
Inky