Well I know what I was like at 13 and based on that I can assure you that you made the right decision for sure. I just found out last week that my 13 year old sister has a boyfriend and I am still kinda in shock. I know that 13 is about the time when they start getting interested in the opposite sex and all but I still see her as a little 4 year old kid, I guess it just hard to believe that she is growing up so fast, and the fact that I am getting older just as fast
Don't sweat it though your son may be mad at you now for a time but in the long run he will thank you for it, especially when he is 23 and doesn't have a 10 year old kid
