Is having my Ex's mom around better?

So my ex and I have a daughter together. We split up 7 years ago and me and him don't talk unless it has to do with our daughter. His mom has always been a big part of my and my daughter's life and has always helped where her son hasn't. A few years back I found out she was feeding info about my life to her son and visa versa until I told her straight our 'friendship' is now strictly 'professional' and only about my daughter. It was hard for her at first as she enjoys my company and she doesn't have a daughter so she leans on me for issues she's going through etc. However, she has recently invited me to go on a week trip with her and her hubby and my daughter and because we get along really well (other than she can't keep her mouth shut and has opinions on how i live) I am not sure if I should go. I used to in the past but felt she was only doing it for my daughters sake and to get buddy buddy with me to find out whats going on in my life. Im newly out of a relationship and kinda need some time away but at the same time I dont want to give her the wrong impression that I want to be her friend again as it complicates things. What should i do?

Is having my Ex's mom around better?
Post Opinion