My boyfriend just accidentally sent me a text that was meant to go to another girl!

holymoly
It said..."last of the flirting for a couple days...i can't wait to be naked with you". It's a co worker and he told me they all had been just messing around and joking and that it was in reference to them making fun of her that she's going to be so drunk at the work Christmas party that she'll be taking her clothes off. I'm really upset because I think it's inappropriate talk even if it's a joke. I don't even know what my question is really...I told him if he ever says anything like that again I will leave. But it's hard to trust him. I know he didn't physically do anything but it still hurts. Should I be worried? Am I dumb for staying?
My boyfriend just accidentally sent me a text that was meant to go to another girl!
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