Hopefully she never actually noticed.
Let me take you back a decade or two to when A 19 year old Big D had just got his first ever grown up job.
One of the people he worked with was a lawyer who shall be known as "Red"
Red had flaming red hair, a smile that could melt a snowman's heart and the sort of figure guaranteed to make 19 year olds go a bit funny.
Big D, in contrast, had a mop of untidy brown hair, a smile that frightened people and the sort of figure you'd expect from somebody mostly living on lager and kebabs. Since he hadn't quite got the hang of doing his own laundry yet he probably smelt a bit funny too.
Big D made a point of trying to be in Red's presence as often as possible. (Big D probably stared at Red's backside way too much too). He always leapt at the chance to help Red in any way possible and on office pissups Big D tried to charm Red with his wit and wordly knowledge. Since he had neither this was probably never going to work.
For a while he even tried to time his exits from work to coincide with hers.
And sent Red the one Valentines day card he has ever sent in his life.

Then, at one Christmas do, Red and her boyfriend took to the floor for a dance.

There's two possible options for what happened next. Feel free to pick one that suits you.
1. Big D watches the two of them together and sees how happy she is. He realises that he probably stands no chance at winning Red's heart. He also realises that he's being a bit of a twat.
2. Big D watches the two of them together and twigs that her boyfriend is much, much bigger than him. He realises that he has probably never come closer to getting his head kicked in. And, obviously, that he's being a bit of a twat.
Not long after Big D left for pastures new.

So, either Red never actually noticed that she had her own stalker or she was incredibly patient with a weird but harmless young man. Who grew into a weird but harmless thirty-something that tries not to be such a knob these days.
(Big D, Thu 31 Jan 2008, 16:37, Reply)