I have three boys and am a single mom. My middle son was close to his dad who has basically walked out of their lives. I have been the only one to always take care of them. My middle son will not talk to me, won't kiss or hug me and is really sometimes just mean to me. I spend a lot of time taking him to his sports, etc. and nothing helps us get closer. I don't want our relationship to be this way but I don't know how to get through to him.