A colleague mistook my follower for my sweetheart

I talked about twitter with my colleague yesterday.
Then, I referred to chatting with my female follower who is my senior researcher. He said "Oh, I thought that you were approaching a new girl.". Regretly, she has already had her own sweetheart.
In addition to it, she must atttract a lot of men because of her beautiful figure.(As I wrote here few days ago, she'll win the female won the first prize of the beauty contest in OPU.)
In such a state, it would be extremely difficult for me to make her my sweetheart.