Sit down, have a nice cup of tea, and then get out of it all.
Husband yells, screams, swears, calls me names and never defends me or supports me in anything... All the while talking about me behind my back and trashing me to his family. What do I do?
Kick him to the curb.
Run, far....far....away.
You analyse what it is that is holding you in a dysfunctional relationship .. And even more importantly why you think HE is staying in a relationship with someone he cares so little for.
This may be a good time to talk about this with him. Not when you are angry or feeling hurt by his treatement but when you both are calm and are able to have an honest conversation about what it is that binds you.
Ask him where this anger and resentment comes from .. is he just venting on you because he's angry at the world, and you are an easy target because you enable it, or does he really resent being in this relationship and doesn't know how to go about getting out of it. Is he purposely trying to sabotage it so YOU will take the first step.
Divorce him.