Boyfriend addicted to weed

Hello everyone. I’m really happy to be here and to be able to voice my struggles freely. I am going to try to keep this short and simple bc it can get long. My boyfriend and i have been dating for almost three years. He has always smoked weed and i didnt have that much of a problem with it until i started seeing how much it took over his daily life. He would smoke 3-4 times a night and had been doing that for 5 years. I recently had to leave him in order for him to tell his family. Now his family knows and they are very supportive of trying to help him in any way. I know how hard of a journey this is but what i am having problems with is knowing when to tell him how i am feeling. Today i found out he lied to me about his sobriety and i was so upset. I told him i was upset and then it made him more upset. I don’t know when its appropriate to be honest with my feelings because he is already going through so much. I also dont even know if him relapsing is a good reason for me to be mad. I just dont know what to feel!!! I love him so much and i want to support him but its driving me insane trying to manage my feelings and his.