Inappropriate behavior?

My fiancé is meeting a women whom he use to know for dinner tonight.. currently we are stuck in different countries because of the virus and I feel a little uncomfortable, because I have never met her and he hasn't been responding properly but I haven't been pushing and I have not said anything negative regarding them meeting or feeling uncomfortable. All of my friend group has said I have a right to say something but honestly I am not sure. I don't want to ha e an unnecessary problem with him I just feel like a unshakable uncomfortable feeling... I don't know. Any advice about future husband, husbands, longterm boyfriends regarding other women. And let me just say it is not that I don't trust him it is just the culture difference they are very conservative so I don't understamd why now of all times is he meeting a person from his past? Hmm 😒