He would leave me anyway

I feel it in my soul that he would leave me down the road. I feel it in my heart that as soon as things are better for him I am no one to him just as I am now. I feel it in my conscience that one day I will look back and be sorry that I didn't let this man 10 years younger than me go and live a normal life of a 24 year old. I feel it in my heart that his mentality is nowhere near on the level to be in this type of committed relationship for he is still a boy. It hurts to realize that but it is a reality and something that I really didn't give too much thought before I started a family with this young guy I knew was not on the same mental level as myself, but love is love and that's what I thought it was. But as much as I love him the feeling in my heart and soul that he will leave me anyway pushes me to stay away and stick with the decision that I've made because I know in my heart that one day he would leave me.