Boyfriends Ex’s sex toy

So I found that my boyfriend still has lube and a vibrating cock ring that he used with his ex.

I asked him about it and he said we could use them. He then explained how he could clean it and it shouldn’t be an issue for us to use it.

I told him I was uncomfortable with the thought of using something that he would use with his ex in this way because to me it represents their sex life and it shouldn’t be brought into the bedroom for us. I told him I know it could be cleaned and sterile (as much as it can be for what it is) but it’s mentally that I’m not comfortable with it. He asked if I would think about it. Am I just being insecure or is this something that should bother me?