Why did he get other girls into drugs but not me?

This is about my ex “situationship” who i have posted about numerous times. Every girl he has gotten into a relationship with, he would use drugs with, or would get them on drugs. He has never offered me drugs. Once, i was with him, and a friend of ours and his friend offered me and my situationship got very mad at his friend.
Why did he get other girls into drugs but not me?
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