I have become friendly with a man I speak to every day at the train station. It’s a fairly small village station, so often just the two of us there. He has a son in my DS’s class at school.
I’m happy to make small talk for 5 minutes, but then feel obliged to sit next to him on the (nearly empty) train when it arrives. I have not done this so far.
My question is, is it unreasonable to just say “goodbye” and walk past his seat to go and sit at the other end of the train? It feels really rude but I can’t make small talk for an hour at 6.30am every single day 
