Hm... So Bernadette fell in love with Blackbird, ran off when Clairen slept with her, kept the scar (given to her by Blackbird) for years, spent the night at Blackbird's place, got kissed and confessed to by her... and only then admitted she had a girlfriend, and is now travelling with Blackbird after all of that. It doesn't exactly paint a 'knightly' picture, which is what Bern always seems to be aspiring to be.
Maybe the reason Bern is keeping quiet has less to do with how Maytag would react, and more to do with how it makes Bern look to admit all of that stuff.
Of course, keeping all of it a secret just makes it all look worse but... Bern herself has admitted she has a bad habit of keeping things to herself.