"Am I over reacting?"
Nah... Enabling a little bit IMHO.
I did the same sort of thing with my GF. She would go to the casino, gamble, drink and call me for a ride. Told her I was no longer her taxi service especially on weekdays and that I loved her. She still drinks and gambles occasionally, but has the casino courtesy drive her home and knows to get a cab in the morning. Sooo I'm no longer enabling and I feel a little better, but as mentioned above the only thing we can actually control is ourselves. An active addict will find a way to self-enable.
Oh Wow! Just realized that your original post was from Feb. and read your last post today just after the bump. Sounds progressive and hope your doing OK.
I Know it sucks. It WILL get better and you deserve someone better. Onward and upward.