It's a very basic human instinct to do whatever it takes to make ourselves feel good. Addicts do whatever they can to use their substance of choice as soon as possible. Us enablers/codependents do whatever the addict wants as soon as possible, so we don't have to deal with feeling uncomfortable.
When my daughter was in rehab and during family week, the counselor told all of us loved ones that we had to learn how to say no. She said if we couldn't, we had no business dating, getting married, or having children.
Margaret, please use this time in your life getting to know yourself and loving yourself. Learn how to say no, how to stand up for yourself, and feel good about it, too! Your son needs you to do that, and he needs you to teach him how to do that, too.