dont trust anyone -vs- right to defend

[life-time-learner]

I have not been a nurse long but have been around the health profesion long enough to know dont mix personal with work, but i have a problem. I work where my husbands exwife works and although we are on different shifts i have had enough. she is a nurses assistant and i am a lpn. They share custody of their girls and i am so tired of hearing how bad she says the girls are and how bad of a dad he is. I have had many people come to me and aske are they girls really as bad as she says they are and my reply in always no. i lost it this week when i was asked this again and i replied only when with her she dont lay down rules and stick to them. I also told a story about how the girls were in her care and flooded the kitchen from a second story bath room before she woke up from being out drinking the night before. I know that i should have not said it and i should have just walked away but enough is enough what can i do? I am tired of her running her mouth about my husband and the girls. Until this point her and i have always gotten along I try to respect her and not talk about my relationship with my husband at work and the person that i blew off to was off the clock and is a friend or so i thought what do i do now?