I've just discovered my ex does cocaine

When I confronted him because yes I still do care for him he blamed me

He said it's because our relationship ended and he turned to drigs

He's a grown man 32 years old but I feel if anything happens to him that it's my fault

We ended on mutual terms but he has been trying to get back togther which I have not consented to

I just feel so heartbroken

I still love him but I don't want to be with him especially now that he does dugs

Am I wrong to feel like this