仔细考虑某事，to think carefully about something, or to say something that you have been thinking about.
reflect on/upon someone/something
I think it would be better if we brought this meeting to a close, and you and I get together once you’ve had time to reflect upon the situation.
I don’t want to reflect on it.
I will reflect upon the offer.
So you might wanna reflect on what that kind of disappointment will mean for him.