About to have twins and my 14 year old sneaks out to do drugs

I really need help not judgment. I'm 30 weeks pregnant with twins and I'm at the point where I feel I need to get my 14 year old out of my house. He's disrespectful. He does drugs. He constantly pushes my husband's buttons until he pushes them too far. He doesn't have his dad. His dad died from leukemia when he was 9. He's tells stories acting like he's abused by my husband. What he leaves out is how he pushes and pushes until my husband's snaps and finally hits him. I'm not saying that's right. I'm saying you can only push someone so far before they snap. He sneaks out to hang out with adults to shoot up drugs and pop pills and he won't stop. We tried making him get a job because we thought he needed structure. Then he decides to tell my husband for no reason "I think I wanna fuck boys." He doesn't. He said it to get under my husband's skin because my husband is Catholic. They start arguing and then start fighting. My husband snapped. His anger got the best of him and put a knife to his throat. I told my husband to stop. My didn't care. He wasn't scared. He spit blood into my husband's face and told him to do it. I don't think he has actual feelings. I'm terrified of having this around my kids. My husband did put the knife down. I'm scared my son is going to push him too far one day and I'll lose both of them and my girls will lose their father to prison. I don't know what else to do besides removing him from the home.

@Kay yes but nothing happened. My 14 year old constantly pushes buttons. It's almost like he wants people to snap and do something so he can run and claim abuse

Edit: He spit out blood because they got into a physical fight because my son kept pushing his buttons and saying things he knows would push his buttons. I knew I would possibly get judged posting this because this world believes all children are innocent when some do infact have the devil in them. It's easy to judge me when you have not met him. Have not seen how he pushes people and tempts people to hurt him. My husband should not have pulled out that knife and I've locked the knives away for now. I do not put men before my kids. I left my son's dad because he was an alcoholic. I am trying to do what is best for everyone