Why did my boyfriends step-mum call me by his exs name?

I’ve been seeing my boyfriend for about 4 months and I get on well with his dad and step-mum. A couple of days ago, she was talking to his dad in the next room and called me by my boyfriends ex’s name. She did it in the context of ‘oh that is X and X’s’. I’m sure she was mortified that she did it but they’ve not been together for 5 years. They were together for about 10 years so I understand that she would have been a large part of their family at some point. But do you not think it’s strange that she’d slip up after 5 years?

At first I tried to take it as a compliment that she’s feeling comfortable with me and has the same feelings she did when he was seeing his ex, but I can’t stop thinking about it. It’s kind of spooked me out.

Why did my boyfriends step-mum call me by his exs name?
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