what should I do about this???

I would tell the guy your first priority is your kids and where you are at in your divorce it is not possible for him to move in with you. Courts do not like it when a parent is moving someone in with them after they just left someone. It is two hard on the kids. To much change at once. Tell him after you have all your legal stuff taken care of you will see. Two weeks is awful fat for someone to be moving in and telling you they love you. How well does he really know you? How well do you really know him? I have been though all of this with my ex and it was a nightmare. I would wait. If this guy really does love you he will respect your decision and wait also.

You said you explained everything to the new guy and he said he understood and will give you time, except that. You child right now is more important. Your husband is probably jealous that you are with someone else, and will threaten you with anything, especially since he had already made an agreement with you. Take it slow, if this new guy is the one, he will wait with you until everything is settled. Think about your child first.

The question I am bothered is, "Are you really over with your husband?". I dont really know the cause for your separation, but I am aware that your husband threatens you for the reason that you are dating some other guy. You might want to consider it that maybe you can still save the marriage for the sake of your children. Or if the love was not there anymore, take it slow. Talk to your husband and explain it to him again whatever your agreements are. Then also explain it well with your kids. Perhaps if the guy your having an affair right now really loves you, then surely, he will understand. And he will wait for you even if how long it takes. That way, you may figure it out if how sincere he is. But as of now, all I can advice is to find yourself first, you might be taking the wrong way or lead. Feel what your heart is telling you, and be firm and stand for your own action and your decision. You may have a lot of advices but it is your decision that prevails.