Is my boyfriend insecure, wtf is wrong with him?

We spent amazing summer together in our summer house.
S went to furniture shop today and I was like"oh look the garden set same as i got on our solarium"
He was like "I didn't even know you had solarium in that house"
Im like"didn't i show you? its ok. Ill take you there next time.
AND HE GOES:"NEXT TIME WHEN? IN THE OTHER LIFE? OR NEXT TIME WE GO?"
... THE F**CK WAS THAT?
Im like:"sure, when i get new car, ill take you there..."
I was confused af.
It was like as if he doesn't believe i really wanna take him there again.
I dont understand him. Why he is like this?
We date since June!!! we were work coleagues and then friends for 2 years before actually started dating!
Is my boyfriend insecure, wtf is wrong with him?
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