Girlfriend stole money from me for drugs for her and her friend

I'm an adult age 18. My girlfriend and her best friend stole a dollar from me and nine dollars from my friend so she could illegally buy a dangerous drug and lied to me about getting rid of it and stealing my money. It isn't very much but I think she might get worse, it offends me they'd treat my friend that way and I'm worried she's addicted. It shocked me because I was okay with her doing it even though I don't like it when she does.

Her friend may have convinced her when they were both high to steal from us so stupidly and lie about their excessive drug abuse. I just hope I'm not being used but she's loving when she's not high. I buy her cigarettes a lot also so she could be using her.

How should I handle this?
Girlfriend stole money from me for drugs for her and her friend
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