Backstory: My sister's last boyfriend was often at the house for tea/dinner, which is a gathering of the family at my house. Because he was a 'stranger', I found it quite difficult having him round, so I didn't speak at all or look at him. I also left the table as soon as possible.
This behaviour, my parents tell me, made her boyfriend uncomfortable, for it seemed to him that I had a hatred for him, though this was not the case.
Now, my sister has a new boyfriend and I am quite anxious not to cause him the same discomfort as I did the last one, for this is something - I am told by my parents - that is important to my sister. Does anyone have any advice on how I could go about this?