How can I help with this please?
Do you have any reason to be there?
Why do you need to do that when he is at work?
To be wholly honest, I think you would be vulnerable to a suit.
It comes down to whether a court accepts you are there to see him rather than to annoy or harass her.
You can always meet him for lunch at the location to which you go for lunch or he could come to you if you are that close. It would be difficult to justify the need to meet him where she is in the circumstances.
From a legal point of view, if your account is accepted then you are not harassing her but from an evidential point of view your account may not be accepted.
Whether she will actually do it or not is another matter.
I suppose she could seek an injunction to stop you attending. Since you don't really need to be there then that is a risk.
She won't get excessive compensation though.
Well, he doesn't have a basis to dismiss her lawfully because their relationship has soured.
That would amount to unlawful dismissal.
I don't do employment I'm afraid. Your original question was about whether or not she could sue you for harassment which is my area.
On the face of it, I think it would be very risky to dismiss her as it seems to me to amount to sex discrimination but that isn't really my area.
All the best.