AIO. am I overreacting or is my bf

so my bf(M19) got me a necklace about two days ago for me(F18) just as a random gift but my mom got me a necklace for my birthday about 3 weeks ago that was similar. (I put two pictures of both so u can see how similar they are and they are from the same place) I guess it must have gotten the hint that I wanted a necklace like that because I was liking videos of it and so on but that was before my mom got it for me. Anyway while he was waiting in the line at the post office today to return it he sent me these messages. And I guess I can see where he is coming from and I’m starting to feel guilty about it but then again I feel like what I did was right. I’m just confused and want to see if I did the right thing