<human>: Can you summarize the given text in a few sentences?

Some background information:  My girlfriend and I share the same hometown, but we live 6 hours away from our families.  I have an okay relationship with my parents, but I am definitely much more independent than they would like / than they perceive children of their friends to be / than my younger siblings.  I am not financially dependent on them.  

I would say my parents and I are on pretty friendly terms, but there are a couple of sources of annoyance: they interject unwanted opinions about how I conduct myself, which I think to some extent is typical of parents of adult children, but it has led to me being a bit distant to avoid it.  There has also been some drama about the frequency and length of time I spend there--I visit a few times a year but they would like me to stay longer and come more and travel with them on vacations, etc.  I try to be polite when declining, but they are very insistent on occasion, and once or twice this has ended in tears or accusations.

Anyway, my girlfriend and I usually come up together and visit (save on gas, etc.) but this time due to her work, it is too difficult to get time off.  I also would feel bad leaving her alone in a strange city during the holiday, when my family is large enough that they will be able to manage without me.

I'm looking for a polite way to let them know that I won't be coming.  This may not be possible, as prior experience suggests they may try to pay for flights, reschedule the day, guilt me into coming alone, attempt to negotiate for a longer visit during Christmas, tell me that plenty of other children are happy to visit their parents during Thanksgiving, etc.  Obviously I can start off just explaining the situation with the girlfriend's job, and I am perfectly willing to be rude if it is necessary to decline without accepting future obligations.  But I am not really sure how to react to the pleading/manipulative stage of the discussion without just saying "I'm sorry, I'm not coming, please stop talking about it."
<bot>: I'm not coming home for Thanksgiving, I predict this will be a strain on the relationship.  How can I decline politely?