Holidays could be the last straw that break a relationship apart. The following are some of the ways that holidays may act as relationship breakers:
1) Financial Strain: In a relationship that is already on the rocks, the expences that accompany holidays may cause strain that may cause it to break;
2) Family Relationships: Holidays bring family members together that may not get along with each other. This may make a marriage filled with conflict prone to more fights.
3) Overwhelming holiday schedule and tasks: Increased tasks and responsibilities during holidays may make couples more likely to fight.
4) Questioning Your Level Of Satisfaction: Holidays make couples more likely to judge their relationship through the eyes of others and the stand point of others, making way for a rift.
http://divorcedmoms.com/articles/why-the-holidays-seem-to-be-the-last-straw-for-some-marriages