I am i wrong to feel like this???Need help

So to make a long story short, while I was at work my SO had company over, his bro & his girl best friend so i guess he was cleaning up & they was saying how dirty the house was & that they was going to help clean up mind you, i don't really know his girl best friend & we only seen each other once basically we not cool. So she cleans up the my bathroom the kitchen & tub, dishes, stove ect.... I feel like that was really out of her place to do that. I thank her & appreciate it but that was not her job to do... you don't walk in another woman house/ territory that you don't know or never went out together & do that.... am I wrong or right for feeling that way? How would you feel if that happened? please help Edit: I feel like he didn't have my back & his to honestly say that we been busy & we will clean when she gets home... he just accepted it cause he sees its okay for his best friend to do that... It honestly makes me look bad as a woman... Cause from a young age you were taught to be extremely clean i mean it wasn't spotless but it was alright.