Hi, my fiancé won't stop using weed (I say 'using' because he now vapes it, which he believes is healthier - despite it often being stronger - and therefore makes it OK). It has been a serious problem for 5 years and I've had enough. No ultimatum works. He's been on a 'once a month' plan for a few months (his idea) but he keeps going to his mum's to vape it. He leaves me almost every evening to bath and put the kids to bed, and comes home late (sometimes falling asleep and arriving back at 1/2 am). I don't know if he's smoking weed every time. I've lost all trust in him and feel that I'm falling out of love with him. He has put on weight because of it, which affects his confidence. It also makes him short tempered. He doesn't smoke near the family home. His addiction is our main issue, and the only reason we argue. When we spend time together as a family in the daytime, we are perfectly happy. I don't want to break up our family, but he knows I can't marry him if he plans to continue. What should I do?