Can text messages be used against me to take my child in a custody hearing?

My son's father and I separated in 2008. I obtained sole custody in 2009 through the Juvenile Courts. Since then my son's father and I have allowed him to still take our son or visitation, when he's not in prison. Which he was on and off up until April of last year. Needless to say for almost the last year, he has been with this girl who has been nothing but a problem constantly butting into affairs between my son's father and I. There have been text messages exchanged and there have been some nasty insults thrown from both sides between her and I. Well today before picking up my child after she butted in again and I told her..what she could do and referred to her as a well not a kind word. When I pulled up, my son's dad informed me that his girlfriend was going to fight me. Once I got there and had gotten my son into the car she tried to pull open my car door and fight me. My doors were locked and I kept driving. So now I no longer want to deal with this because my child was in the car and that is crossing a line. My son's father basically ambushed me. So if I revoke visiting and he takes me to court, can text messages result in my son being taken from me? I am an honor student and senior at The University of Toledo and have no criminal background other than traffic violations. I need help. I feel trapped and like I'll never be able to live in peace.