The current checkout girl update

I have realised over the past 4 years of my employment that it is very easy to be respected, loved, envied, hated and admired by many members of the same team.I am the perfect age to be respectful to my elders, childish and fun enough to get along with the teenagers, I can keep a secret for the more cautious middle aged staff and have a sensible head for when my Manager is nearby. I am not overly pretty or plain looking, have sensible curves which make me fit in the 'not too thin' category and mid-length brown hair.
So why did I suddenly become the centre of a male colleagues attention?
One of the males,I shall refer to him as Cpt. Creepy, started to send me little messages on a well known social networking site. We had never really spoken before at work other than to pass the time of day or to enquire about various stock for customers. Then I would log on to the site and there would be a 'Hello' message from Him. The messages evolved from the topic of 'how was work?' to 'looking foward to seeing you at the staff party' until the messages erupted into full blown cyber-sex. This swift turn-around in instant messaging took place over a matter of weeks and although I was becoming uncomfortable with the increasingly sexual content of the messages, it put a smile on my face whenever i walked past him at work.
We still did'nt talk at work. He would take a different route when moving stock around the store to make sure he went past the checkouts as often as possible. I would happily wander into his department to make customer enquiries, whereas in the past the telephone was good enough for a quick stock check.
It came to an almost abrubt end when he started hasseling me to visit his flat for 'coffee'. Usually coffee at a friend's house is fine by me, but 'coffee' with inverted commas just is'nt my thing. No matter how tempting, I regard it as cheating and it would destroy my relationship with my Bf. I offered him a lift home so we could talk about my reluctance to ruin my homelife, we parked outside his place and he tried to kiss me. So I freaked out. He went to his flat and I went home to my Bf. It could have been the perfect affair,but alas, I preffered to string him along and then turn crazy at the end :)
He deleted me from his freinds list on the networking site and continued not speak to me at work. Very grown up for a man 8 years my senior.
After speaking to my colleague Ms. Mucky I managed to gather some rather damning information about Cpt. Creepy's behaviour towards women workers in our store. He had been moved from one department because of stalking a young female employee and is now manager on the only male-only department in the store. Many other girls had been approached by him with a single text saying 'Hello,how's you??' or and instant message on a networking site or e-mail etc. It all began to sound very familiar. He did'nt have a type, just female would do. So maybe a few acts of revenge for my fellow sisters that had suffered his attentions would be in order, I just have to decide what to do and how to do it :S