Need HELP!!!!! 😩

So I started dating a crush I had in elementary school and things too a turn for the worse. I’ve know him since 6 grade. While dating for the first few months everything was great he showered me with affection. Now I knew he smoked weed but then I find out a few weeks ago that he also does cocaine. He said he would do it anymore because he wants to have a family with me, well today I see him actually do cocaine in front of me and I’m angry 😡. He doesn’t see my frustration and questions why I want to end things so quickly. Am I wrong for wanting to walk away instead of helping him over come his habit????