I had posted before I need advice

Need advice not mom related.

My boyfriend is 48 and drinks almost every week for like 2 days how do I talk him into stopping or just leaving him for drinking I left the father of my children for drinking and I don’t want to repeat the same thing being with a person who drinks often.

Update we have an age gap im 26 that’s beside the point yesterday he was drinking still and someone kept texting him. I looked and it was his nephews wife they are supposed to meet up to hook up on Friday when his nephew goes to sleep they are booking a hotel. I didn’t say anything he treats me like a queen I can’t believe he’s trying to cheat I’m so heartbroken I don’t know what to do this all happened while drinking should I say anything to him or just wait until Friday and see what happens? Also she’s the one who started texting him and kept asking to sleep with him. She’s doing it for money it seems like she’s having problems with her husband and is asking men to sleep with her for money.