FWIW when anyone who is your spouse, BF, GF, family memeber you live with, rages at you and tells you to F**k Off, they are being abusive. This is demeaning and emotionally damaging for you and for your children to watch.
If he is lying in addition to raging those words at you then he is an abusive liar.
Love for yourself means respect for yourself. Respect for yourself means not having to tolerate abuse.
If he was cheating with another woman instead of a drug, would you stay? Just a thought?
You can test him for drugs, but with the lack of respect he has for you and the emotional abuse he is spewing at you, I think you know the answer and it will be up to you to decide how much you need to respect and love yourself and your children.
The choice to tolerate this or not is yours. Trust is a fragile thing and can be broken easily but the repair is very hard.