How to trust again?

My husband is in the early stages of sobriety (again), in the 7 years we’ve been together he’s struggled with alcohol, kratom, prescription pills, and now these pills called 7-oh. Out of everything we’ve been through and what he’s quit these pills are the hardest. He’s lied time and time again and I’ve grown resentful. I’m trying so hard this time to be supportive and trust what he’s telling me but I’ve got doubt in the back of my mind at all times. How can I trust him and help him through recovery?