Boyfriend is upset

On our way home today I saw a girl on a bike who I thought I recognized as someone I knew and had a bad past with and I whispered the B word ( I don’t cuss LIKE EVER ) and I realized quickly it was not her so I felt pretty bad.

My boyfriend heard me and goes “do you know them” and I realized around that time that no.. I didn’t.

And he goes “you wouldn’t like that if I said that to a female..” and I go absolutely.. it was rude.

Then silence the whole way home. He got out and said “you know why I’m upset right?” And I kinda hesitated but said yes because it’s not like me to cuss and it was rude of me.. I wouldn’t want him to call a girl a b word by no means.. the whole way home I was thinking to myself “why is he so mad over a cuss word.. he cusses a lot.. but I don’t so maybe I caught him off guard”.

So he shuts the door without kissing me and goes inside. I had to come back to grab something and I realized by a text he said “you made noises to some guy on the side of the road yeah I’m pissed”

So he thought 1. It was a guy I was talking about 2. He didn’t hear what I said..

So when I circle back around I jump out and try to explain and he’s just not having it.

I texted him and explained everything how it was definitely a girl middle aged with her hair in a pony tail on a bike.. and how it all made sense from my side to. The “you wouldn’t like me saying that to a female” now it makes more sense as he thought I was flirting with a guy. But gosh no.. it wasn’t even a guy..

He’s upset with me and isn’t really talking.. just wanted to vent because talk about misunderstanding.. 😩 this is why I just don’t cuss.