Friends with benefits is moving away, what to do?

One of my friends has a friend with benefits, and she thinks that he cares about her. Over time she began to really like him too. They would always be together and they have moved in together. She found out that he is moving soon and doesn’t know what to do. She says that he is starting to act strangely (more aloof) but he isn’t good with communication so she has no idea what he feels. Now she feels like their friendship is breaking and obviously dating is out of the question. She thinks she should stray away and spend less time with him, but I don’t know if that would best. I suggested she spend good quality time with him and be HONEST about she really cares about him while it lasts, but she is afraid of rejection/scaring him and being hurt from the separation.

What do you think?