Am I supposed to break up with my boyfriend before meeting his family?

I have been seeing a guy for a couple months who is absolutely great, but I am not in love with him, and I am not sure I am going to be. With the holidays coming, he has a lot of family stuff happening and has invited me to an event soon.

Since I don’t think this relationship has forever-potential, should I gracefully bow out of the family thing with some kind of excuse? Just go and be polite? Or am I supposed to break up with him completely? (I am reluctant to do this since I have been going through some weird, potentially hormone-based moodiness lately.)