How do I get my friend to move on and be drama free?

I basically have these two female friends at work and we are very close almost like stisters.

One of them was dating my mangers step son. I never liked my mangers son and could see straight thought his nerdy, shy boy act. I didn't find it cute or funny and he treated me like shit before he knew I didn't wanna play along with his games.

Once he met this new girl who me and my other friend quickly became really close friends with he really changed and starting being really nice. People did warn her but he's a flirt but she accepted it.

They went out for around 8 months and she was starting to lose feelings for him but he'd already bought her tickets for them to go London and see the lion king for her birthday. She told him how she was feeling and said but she thought the trip to London would be good for them because it helped her figure out her feelings for him outside of work and everything.

Apparently he kept wanting sex from her and he had a breakdown in London saying she made him look like a fool because she wasn't given him much affection.

After that she started seeing red flags and he starting accusing her of all sorts. He said he was never saw if she was cheating on him yet she works 12 to 8 and has a 2-hour commute to work were the hell is she finding the time to cheat.

She said she still needed time away from him to figure out how she was feeling but instead he sent her a bunch of abusive texts. They decided to brake up on good terms eventually.

Them she comes into work and we find out he's been spreading awful rumours is about her saying she cheated and is a slut. When as soon as they broke up he went hanging around the girl he told her she didn't need to worry about and I swear to god I once saw tinder on his phone but I never said anything.

Now she's got dirty old men at work sending her inappropriate messages because they think she's a whore and she can't report it because of who is dad is

Updates
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She's transferring and he's leaving next week so hopefully that will help but she keeps sending me and my other friend messages constantly about her ex and I think it's driving her crazy. Her mental health isn't great and this isn't making it better.

Me and my other friend were planning on getting him back and calling him out on his shit but we just don't think it's worth it anymore because it's bringing back up for her again
How do I get my friend to move on and be drama free?
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