Boyfriend's mom called me by his ex's name.. why?

So him and his ex have been together for 4 years... and his ex had a really close relationship with his mom... they broke up almost a year ago and we have been dating for few month only.. his mom had some wine (i don't think she was that drunk) and she just came to the room.. sat on the chair.. looked at me and said "well hi there ***his ex's name*** i haven't seen you in a while"... the thing is she hadn't seen me in a while too... so i hope it was just out of habit, hope she wanted to say my name but slipped... she than apologized to me and said to my boyfriend "' please don't tell your father about this" than we continued convo and she said my name 2 times after that... so do you think she likes his ex more or she just said that out of habit? do you think there is more to this or am I just overthinking?
Boyfriend's mom called me by his ex's name.. why?
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