Why do a disproportionate amount of couples break up in the month of January? Statistics say that divorce lawyers do their best business in the first week of January. Is it post-Christmas blahs? Is it because they feel like they would be too much of a snake to do it right before the holidays? Is it because they don't want to be alone for the holidays? Is there a relation to the crappy weather? Is it because you acted like a jerk on New Year's Eve?
I think it probably has to do with the pressure that is put on us to evaluate our lives at the beginning of each new year. We are expected to make resolutions and keep to them. It causes us to think about our lives in general and our love lives are a very important component of our general happiness. This leads us to believe that the grass is greener on the other side and that we can't possibly be as happy as we could be. And before you know it John Smith or Jane Doe is single again.
Like the entire world is going through right now, January is also a financial crunch time. We are slowly recovering from the overspending we did over the holidays. Holidays mean plane tickets to see family, dinners with friends, gifts for loved ones (including the person you are about to dump), and New Years Eve outfits. This money stress is often the straw that breaks the camel's back. If there are any cracks in the foundation of the relationship sometimes the financial stress will bring it all tumbling down.
We put off things we don't look forward to doing until we can no longer avoid them. January is a month of renewal, recovery and self-examination so sometimes our relationships fall victim to all this navel gazing.