My boyfriend still wears wedding ring from ex wife

He wears it on the other hand and he got the engraving of her name removed. But he loves the ring - it's really different and unique- and he says when he looks at it it doesn't remind him of her he just admires the work of the jeweler. They have been divorced 6 months. I don't really know how I feel about it. I told him that it makes me feel uncomfortable but I'm happy that he has something in his life that excites him and makes him feel good. It was actually his therapists idea for him to start wearing it again so he can do something just for him and who cares about what anyone else things. How would you feel if this was you?