Threw me through a loop...

This morning I woke up and was getting the kids ready for school and my oldest asked me if I could go with him to his field trip. I explained to him that I really didn't have the gas to go and was still a little sore and couldn't be walking around all day in the heat. Then he asked me if the person I am dating could go with him. I told him no that's not a good idea. Then we get home and he tells me it is hat day tomorrow and asked me if I could take him to the store to get a hat...BTW we just left the store and he never said a word about needing a hat. Then he asked if the person I am dating could take him to the store to get him a hat and when I said no we will take care of it tomorrow he looked at me and said that he was going to call Charles (the ex) and ask him. That bothered me so much on different levels. The first think is the relationship I'm in is new and really worried about my kids getting attached because it's early and I don't want them to get hurt if it doesn't work. The second thing is that my son feels comfortable calling or texting my ex about stuff. So today I had to sit down and talk to him and explain that he is not to call him or text him about anything. When I told him that he just had this look on his face like everything I was telling him didn't make any sense. It broke my heart because I know my son has a void and a need that I can not fill, no matter how hard I try. It broke my heart and all I could do tonight is cry. I wish this was easier.