Relationship advice

So me and my bf are soon moving in together soon..we recently had a daughter who passed in my second trimester ..he told me today that he wants to buy an infinity g35 and i told him we can sell my car and use ithe money as a downpayment towards the infinity..He said he wants to get it on his own i got really upset because it seemed to me that he wants to act like a single guy in it which i told him why cant we buy it together and build as a family like were supposed to..Am i overreacting or would you ladies be mad like i am if you were in my situation?