"I need space" to "I want spend more time with you"?

I startes dating him last summer (2021)

And up until April 2022 i kept hearing "i need space... i need time for myself... im not ready for serious relationship"

We were dating all this time, sleeping together

We moved to the same department so worked together 9 h 6 days a week too

What changed in him

Im even so confused i dont know what to sat how to react

Why now he says he wants to spend more time with me?

"I need space" to "I want spend more time with you"?
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