You have known him for 15 years.
Your love rekindled a year ago. He was totally honest about his addictions & you broke up because he continued to choose partying over you.
He is 6 months sober
After breaking up because he chose partying over you, six months later he contacted you & you "hooked" up but he ghosted you for the next 4 months because he was ashamed about how he acted.
He is not pressuring you now to get back together but currently told you "He says he believes having me in his life again will be another inspiration to keep him on his better path."
Question:
How long was he addicted to coke, alcohol, & gambling? BTW that's a fairly common combination.