Am I being too sensitive? 😪

So, to put it as short as possible. I love my boyfriend, he means the world to me. But honestly, he keeps talking about his ex some of the time. Which I get and it’s fine. But tonight, I shown him a picture of what I got him/us for Christmas (pic down below), and to the which he said: “I wish I didn’t fuck it up with ________, cause her and I got necklaces like that.” And I got mad, and I wanted to cry. But I just walked out of the room, and walked it off. Am I being too sensitive? It honestly hurts so bad, but just the way he said it, I don’t know.