All good, I too get too busy to check sometimes, the main issue was dealt with already anyway.
You're right, there is a distinct difference between harassment and attempting to mate. If he is so bent on showing her aggression it's reasonable to expect things will only get worse between them, as this is generally how it goes when two animals that were fine together suddenly have a relationship breakdown like this and it persists beyond a simple fight or two. Left to continue eventually he will likely either kill her or bully her to the point where her health suffers. If that's the sort he is, getting him other guinea hens will likely only ever end up the same.
In this case it's probably because she was unwell, but regardless of the reasons, it's pointless and difficult behavior to deal with so I personally get rid of animals that abuse ill or injured animals because otherwise you end up breeding on a very intolerant flock which harms animals needing tending before you can tend them. I'm the master of my flock, so I decide which injured or ill animal needs to be culled, I do not allow them to take that decision out of my hands. Many good animals could be killed for something as simple as a small easily treated wound if I let the animals decide which ones die or live, and if I bred those sorts on.
Intolerance has a strong genetic basis in animals and just like bullying it's something that can make the flock's social life as well as your animal husbandry very stressful and wasteful in terms of resources like money, time, effort etc spent trying to fix wounds caused by bullies, and pointlessly destroyed lives of otherwise good breeders, etc.
So, depending on what your preferences are, your options are probably something like this: you could keep him and re-home her, or the other way around, or keep one of them permanently separately caged from the other. It's all down to what amount of extra work for the duration of your bird-keeping you're willing to deal with, if you breed on from his bloodline.
There is a very slight chance he will relent but personally I would not bet her life on it.
Best wishes with your decision and flock.