Dear confused88, speaking from personal experience, the white powder around the nose does sound a bit of a giveaway, his behaviour is suggestive of using coke, but guessing aside, have you asked yourself what do you want to come from knowing for sure if he is/isn’t using coke? Will it change your relationship?
I’ll tell you now, the constant guessing and trying to catch him out will load on the tension between you both, it isn’t healthy for a relationship.
I don’t know how you are as a couple, but if he isn’t being open with you when you’re directly asking, before you press him on it again, I’d recommend just deciding what difference it makes to your relationship if he’s using coke.
And don’t get me wrong, I get it, it isn’t nice when people we care about lie to us, and I’ve been lied to too, my bf is as an addict, what he doesn’t tell me is more from his own shame than anything else, and more so now, because we know each other so well, he doesn’t tend to lie so much. If he does i know, I laugh, then he laughs and admits the lie.
But if you can give it a little bit of time, hold back from trying to catch him out, perhaps wait until he relaxes again and meanwhile just consider the likely scenarios, perhaps you’ll find a more natural opportunity to speak and you’ll be sure of your view on any given scenario.
Living with an addict is not ideal, but at the same time, I’m sorry to say, people have to be themselves, whatever that looks like.
I wish you the best possible outcome. Xx