So am I being out of order here?

My bf has had a cocaine problem which he was introduced to by his cousin- anyway he’s turned over a leaf and stopped it as we are having a child so he hasn’t done it in like 2 months. so his cousin is having a stag do abroad, I know he’ll do it if he goes away with him. I don’t want him to go, do you blame me ? - also before anyone shames me for having a baby with him it wasn’t planned x