He told me that he saw me in Umeda.（precisely speaking, he saw me in Whity Umeda*1）
Because he was walking around Umeda with his friend who is not familiar with me, he couldn't speak to me in order not to make him wait for nothing during conversation between me and him.
If I had noticed his existence, I would have spoken to him whether he was alone or not.
I can't take third party's feeling into consideration.
*1:The name of the underground shopping center.
