I think Hampton Court has it spot on here.
Sometimes when we are in a situation, we are blind to what's in front of us. The more I read of this thread the more certain things are screaming out at me.
Your 'husband' goes away without you with his 'friend'. Multiple times. Even when you go away as a family his 'friend' comes too. Wtf!
Then they go for drinks while you stay with your daughter -gets better and better.
I am wondering if your daughter has found something out that you don't want to see, and cannot deal with it. Hence the behaviour.
Your home life is so dysfunctional and has been for a while that I feel you've lost sight of whats 'normal' and acceptable.
I would have kicked that useless tosspot out ages ago, but you are packing his bloody suitcases. Holy moly! He's got it made and he's laughing at you.
You need to ask yourself as his wife, what his friend has that makes him crave his company instead of yours. I think you probably know the answer to that question already.
Then pack the disrespectful assh*les case/binbags and sort out your daughter. You are already a single parent by the sounds of it.
You might find out that once he's gone and your daughter sees you getting a backbone taking control ,then she might work with you.
I have three teenagers/young adults and don't recognise any of this behaviour displayed. But I am of the tough love parenting and wouldn't accept any of this malarkey.
Set boundaries for both of them and demand respect. Demand truth and honesty. Stand for nothing less.
I wish you luck.