Boyfriend left my stuff, wouldn’t go get it?

My boyfriend left my sweater in his car. When I asked for my sweater he looked for it then concluded he left it in his car and said I could use his blanket. When I said I didn’t want the blanket and asked if he could get my sweater he looked for it in his room again then said he left it in the car and he’d get it later.
Disappointed, I walked out and went back home. Was it that big of a deal?
Boyfriend left my stuff, wouldn’t go get it?
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