What could this mean?

Hey, I split with my boyfriend few months ago. We live in different countries but had split our time between the two. We were together 3 years, the split was awful, he ended things and tried to come back, I decided I didn't want to as to be honest it wasn't healthy. Since the split he has been vile, degrading and just nasty. He is blocked on everything. He can only get to me on a game, that I have distanced myself from. Now the question I want to ask is he now has a new girlfriend which hurts but I'm fine with. It's like welcome to hell for her!. But when I saw a recent photo of them together, he was wearing a necklace that I had brought him. The necklace was sentimental to us both because it was how we met, and also I called him my king i used to kiss it everytime we were going to be apart ( soppy i know but it was our thing) . Why would he still wear it? And why would he want to? . I removed my necklace because all it did was bring pain of what we once was. And I wouldn't dream of wearing it if I was with someone new. Getting a male perspective because I don't get it. 🙃

What could this mean?
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