Need advice to get my girlfriend back

Long time lurker first time poster.. I got into pills about a year and a half ago. My girlfriend knew about it and it started off casual but like everyone else who gets into pain pills it spiraled out of control. I went and got help and she stayed with me. I live in Alabama and I ended up buying this shite from a gas station and got hooked instantly. It’s called tianaa. I was terrified to tell my girlfriend because I didn’t think she’d stand by me again and she’s the best thing to ever happen to me. I tried so hard to get clean and I couldn’t. I tried for months, I finally had to go get help. I didn’t want to hurt her so I would lie to her about where I would go when I was going to the doc and other bullshite. I got clean but I was so scared to tell her she thinks I’m still on it and broke up with me.
Now that I’m clean I regret not just telling her everything and I’ve worked so hard to be the man she needs and deserves. I want her back so badly it fuels my sobriety and she won’t even talk to me.
Any advice to get her back? Letting go isn’t what I’m looking for here.