Do you think he knows her?

My partner wanted to take our son to therapy out of the blue... when we get there we are talking casually then park. Then a new car shows up to this same therapy place ive been going to. Shows up its a girl. She looks right at my partner driving in. And a few more times they both look at eachother getting out of cars and going back in. This made me feel very uncomfortable. What do you think?