Relationship Advice: Dealing with Partner’s Addiction

I need some help. My partner has been sober for a year and recently relapsed. Would occasionally take a Xanax or Adderall but not doing heroin or meth or cocaine or anything did before. That’s still a slippery slope. Also was smoking weed. He got called in for a drug test and just lost his job because he knew he would fail. I’ve been super supportive but put my foot down that he stays sober and doesn’t touch anything not even the weed. His family is upset and devastated. I think they blame me because I take Klonopin and Adderall (valid prescriptions for me and my needs) and this all started around the time we started dating. But it wasn’t because of me. So I feel his family hates me and blames me. Anyways, I’ve never dealt with addiction. This is all new to me. How do I handle it? Is it worth it and my energy and time? Or what do I do? I told him if he ever used anything again we are done. I love him I really do. But he’s 34 and I’m 23 and still in school for health care. He needs a solid job and to stay sober. Which he wants. But I don’t know how to deal with this. It also feels he is ashamed and is pulling away from me since losing his job and relapsing. I can’t explain everything and I know that makes helping me difficult, but does anyone have experience with this? What would you do? What did you do? I appreciate it!

This is his second chance. He hasn’t blown the second chance yet and is getting help. Should I not give him a second chance?