Should I stay or move on?

I’ve been dating this guy for a little over two years and we get along very well and have built a strong relationship but he’s gone down a road of drugs and alcohol thanks to his dip shit friends. I have tried to talk him out of it but he get defensive and tells me I need to get out and have fun. My plan is to move in the summer
for college and he planned to go with me. Im starting to second guess our relationship but it also feels wrong to leave someone Just because they aren’t making good decisions. What would your do? Stay and continue plans or leave and find someone serious about their future?
Should I stay or move on?
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