Are you not sure where your relationship is going?  Most people during the holidays unfortunately feel this way because of all the built up emotions that occured through out the year.  You may ask yourslef if it is worth even holding on to it or just simply letting it go. 

Ask yourself how you feel towards these ambitions? Do you see yourself with this person forever or do you feel that you will be questioning this for the rest of your lives together?

Either way, you need to follow your heart.  If you are always questioning your relationship, I can assure you now that it may not be the right one for you.  You will know this when the right person comes your way. 

Although, there are ways in adapting and fixing your relationship if that is your will to do so.  Start by what makes you happy most of all before anything else.