You learn your husband has a drug addiction, and is using hard drugs in the house -- even in front of the children. Nearly all emotionally healthy people would insist that he either get help and get off the drugs, or at least a boundary of "no drugs allowed in the house, until you decide to get some help."
Well, what if he's not "ready?" What if asserting such a firm boundary only drives him away from your home, and your children?
Again, most of us would say "We'll, that's not what I wanted, but it's more important to protect my children -- and myself -- from his destructive behavior. " It's a non-negotiable boundary of personal integrity.
For some, continued, unrepentant infidelity is just a line. For others, it may not be, or it may, but they decide "I'll give it six months, do everything I can to become a better spouse, and then he will have to decide."
It all comes down to what YOUR boundaries are, but if one if them is "I will not share my husband with another woman," then I would advise them to lay that boundary immediately.
