My boyfriend thought a memory with his ex was ours?

My boyfriend was talking today about this memory he had with ‘me.’ However, this never happened with me. It must’ve been with his ex. Does this seem suspicious or is it nothing to worry about? Like he’s bringing up this memory he thought happened with me, but it didn’t. it must’ve been another girl. I’m a huge overthinker and I just want to see another’s point of view on this.

My boyfriend thought a memory with his ex was ours?
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