how would you handle this situation ?

My husband has a friend . I don't like her due to the fact that she created a lot of problems between us . She falsely accused me of cheating somi disliked her right there and then ( false story to which she wasn't there, heard something and went and told him but proved wrong because I was with my mom and dad and his parents ) and many situations where I felt like he picked a group of girls over me (now he continues to only talk to one of them) 
Last year in December when him and I were only still engaged he had a Xmas work party and he never mentioned it until the day of, I flipped and wondered why ? Turned out that her and the other girls said they wouldn't go if he brought me (they worked for him) so he left me behind. He left me behind!!! Because or else they wouldn't go ! I flipped and I broke up with him . We lived together I moved out to my original hometown with my parents 2 hours away from where he lived . 
2 months passed And him begging and saying he would make things right , I took him back . One of my requests was that I didn't want him to have anything to do with those girls if it wasn't just work related . He agreed, everything was great . Move forward to this day , I see her text him "hey brother ! Call me later " I looked at his messages with her and they've been talking all this time . She talks to him about anything and everything ! Who she fucks , who her toy is ... etc . I saw that he even invited her to my wedding !! (I told him If she would of shown up and I'd see her as I walked the aisle I would of turned my ass back ) I then saw her reply back "don't tell me to go eat a dick, respect me" which wasn't in his texts meaning he deleted that and forgot to delete her reply .
So Ive flipped, We fought for 2 days straight now and he says he isn't  going to stop talking to her. I need advice . I have no friends lol so I'm here looking for another woman's advice . How would you handle this situation ?