I have read the threads and they are fab, well done to you. It seems that you are happy and thats great.
It sounds very familiar to a cousin of mine who met her husband at work. He is top boss and was married but was going through a seperation from his wife, things were not working out and he got together with my cousin, she had a good job but at the end of the day he was top boss. They got on well and one thing led to another. He treated her really well and he ended up divorcing his wife (it would have happened) but instead of rushing in to things he moved in to a flat and never moved in to my cousins place until the right time, he even waited for his children to ask to meet her and when they were happy he eventually moved in then they bought a fab place together and got marrried and are currently expecting a baby. She already had a child from a previous relationship and he had 2 but they all got on so well. He just was decent and mature enought to work things out decently. They still work together and at the end of the day the gossip wears thin, people end up with new gossip and your news becomes old news so really dont worry what people think, they all live in their sad lives and are prob jealous and craving attention. As long as your happy thats what matters. As for your immediate boss just rise above it (as you have been) and let her wish to know things but keep it to yourself, she seems untrustworthy and you would not want her to throw a spanner in the works and ruin your happiness (sad cow she is!!!) God, I have not even met her!!!
Best of luck and really happy for you