Bf wears necklace ex wife gave him

Am I overreacting? I had an argument with my bf because he always wears the gold cross (with Jesus) necklace his ex wife/babymomma gave him. Legit always 24/7. I told him to remove it and how it's disrespectful to me wearing something a past ex gave to you since I don't do the same. He admitted if I did the same he would be pissed.

Am I wrong for asking him to stop wearing it and put it away?

They left each other in 2018. He and I have been togethor for 1.5 year