Called her my ex's name?

My ex and me started each other as friends (with my girlfriend knowing and she doesn't really like it) on Facebook chat. Anyway so my girlfriend (of 2 years) and me were making love. Well I was in the moment and I said "I love (my exes names). My girl got all upset and she said something about me thinking that my ex more is hotter then her. She started crying and then left (we're living together). I did this to her before on her birthday but we made up later that. I called her begging to come home then I called her my exes name again by mistake. She told me I'm a prick and hung up on me. What should I do? To it worse they're don't sound alike.
Called her my ex's name?
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