Should i end it?

Ive talked to him about this once, that he doesnt pay attention to me enough, he doesnt think about me enough, perhaps that he thinks i will always be there, too scared to leave him. He said hed change. Its been a couple of weeks. I dont see change. He is still off every night with his friends partying till 5 am. He is doing drugs and destroying his life, i have told him so many times that that’s wrong, ive showed him that i care all he says is “youre right”, but i dont see ANY change at all. One more thing, perhaps he is not over his ex? Before meeting me he always reposted stuff about missing her and loving her and he generally loved her so openly… why am i like a side chick? He never reposts stuff about me, he never talks about me, he never waits for my replies or my notifications. Why was he so nice with her and why am i stuck with this non chalant version of him? I have come to realize that my days depend on how he treats me. This will become toxic but i cant just leave, i know he cares about me…