Trying to Help My Boyfriend Stay Clean

Hello, I am in search of some advice on how to help my boyfriend kick this habit. I have never been addicted to anything in my life, so I am trying to support him. He has been smoking for about 10 years and it was heavt maybe 3-5 times a day. He stop smoking when we met about 3 months ago. He did it cold-turkey and it seemed to go very well. He only had 1-2 days to which he had cold chills, ect. Now, he is having trouble dealing with his emotions. He has said that he would get high to feel good, but then if he felt too good he would smoke to calm him down. I am not really familiar with any of this. I love this man and want nothing more than to support him. I could use some advice on what to expect and how I can be helpful. He lives 2 hours away, and I only see him every other weekend, due to our kids. We do talk everyday but sometimes the distance just is too great. We are trying to see each other at least once a week when we can. Please help me. I have suggested faith, believeing in god that we can overcome anything. But, like I said before I have never known the power of addiction. Thank you for helping.