First of all, you can tactfully find some reasons to meet somewhere else. If not, you can also explain to the man in advance that we are only dating, so we can't confirm the relationship at the first meeting. So if you meet in the restaurant where I work, please understand. If you meet our colleagues, I can only say that you are my friend and come to me to do something. I don't want my colleagues to know the real purpose of our meeting. I hope you can understand, and I think this person will understand.