He has called me the wrong name..

So me and my boyfriend have been together about 4 years now.

He has been married one other time. He introduced me to her before and It didn't bother me. They have a child together he's 25 now. They got a divorce back in 2001 so when I moved in they have been divorced for 16 years. The first week I moved in he got up out of bed to go pee and I followed cuz I had to pee too and in a sleepy voice he called me her name!! That just broke me and he didn't even realize he did it. Then just recently my little sister came over to stay tonight with us and she went to the bathroom and he went to go to the bathroom and she was in there and he said "oh I thought you were (said his ex wife name)

It has messed me up so bad I hate her I hate her name I hate everything about her now since he has called me her name 2-3 times. I would understand calling me the wrong name if they just recently got a divorce but damn next year is goin to make 20 years since there divorce, so why so hard to call me by my name??!!

Every time I hear her name I cringe I get agravated. An I never had that problem before. I didn't mind meeting her and seeing them at the bar when we was there but since he called me her name a couple of times I just completely Hate her!!

Idk what to do...👿😡😫