["I'm expecting a friend who I haven't seen in years to come over tomorrow. I'm a bit nervous about seeing him as I'm not really sure how much may have changed since the last time I saw him."]
It's exciting that you will be able to reconnect with an old friend. I understand that you're nervous, though!
I am expecting a friend that I haven't seen in years to come over tomorrow. I'm a bit nervous about seeing him and how much may have changed since the last time.