Should I cut ties and move on?

[geekchick]

I'm an entrepreneur building a personal and business brand. I deal with a guy who's supposed to be a PR and marketing person but all he seems to do is waste time, money and is innappropriate. He has an assistant who is very negative and I feel she tries to get information about me to give to him. I'm all about making relationships last but I've come to an end with these two. I'd really like some advice on my situation. I'm on Facebook with the assistant and am thinking about unfriending her and letting him know we won't be working together anymore. I'd also like to protect my personal and business brand and this would seem like a great case to do so. Thanks,