DBF and I have been dating for 5 months in a close relationship where we spend a lot of time together. He is separated from his wife and has been for 3 years and is divorcing. He has great relationships with his adult children (early 20s) and is caring and loving to them. He sees one of them, his son for dinners/coffees and lunches 3 times a week. His wife knows about me and his friends, some of whom I have met, but to his children I am referred to as a friend. He is hosting the Christmas lunch and his children will stay for a week. I completely understand that dating 5 months isn't long, but by the same token his children are adults and I can't help feeling that I am compartmentalised. He is busy talking and making plans for Christmas none of which include me from Christmas Eve onwards and I am feeling a bit hurt. I also completely understand that for important things his children should come before me. But I think he feels his children will feel upset if they know he is in a relationship and he obviously wants to avoid that notwithstanding whether their reaction is reasonable. I don't really know how to handle this situation because it's delicate and I wouldn't want him to think I am resentful towards his children.