So am I a jerk?

So today my boyfriend gave me a $1200.00 ring with three round stones. I was shocked. Then he asked if I liked it and I said yes. Then he proceeded to tell me they had that ring also in princess (square) cut. So I asked he could exchange the ring for princess cut since it's my favorate. And it really made him upset. I've clarified a million times a don't like round cut diamonds and since Kay lets you exchange with no problem I thought I should tell him I'd prefer the princess cut now I feel like a jerk since I made him upset. I was just trying to be honest. 

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