Boyfriend still has a custom made matching shirt he wore with his ex at a baseball game. am I wrong for being annoyed?

They got custom shirt for a baseball game made and he still has it. This was at least five years ago. It was hanging in the closet and he was moving shirts to donation and the rest to a drawer. He pulled it out to fold and put away. He can’t even fit it anymore. It’s too small. I’m annoyed bc I said something about it and he claims it’s the same as all the clothes we both wear bc we wore them while with an ex. That logic pissed me off.

Boyfriend still has a custom made matching shirt he wore with his ex at a baseball game. am I wrong for being annoyed?
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