Why do the numbers on a scale matter so much????

So my stepmom and I started this diet and today begins day 4 (we have 13 more days in this first phase).  Well, the diet is really, really tough for the first week and I am totally ticked this a.m.  I got on the scale this a.m. and have GAINED WEIGHT!  Seriously????  We took our kids to the movies last night and I completely resisted all the popcorn and candy that the family ate!  I mean, I could eat all that junk and gain weight!  I don't have to torture myself watching everyone else eat that stuff to gain weight!  Why am I resisiting in the hopes of sticking to this diet and losing these last few pounds???  So frustrating! 
Yes, I know that gaining weight is part of any diet.  Weight fluctuates from day to day based on a variety of factors (water, how late you ate, how much sodium you ate, etc.) and I shouldn't take any one day in isolation.  Well I am really not isolating today - the first day I lost a little weight. The second day I stayed the same and then today I gained!  And today is a rest day to boot!  I am trying to convince myself that I don't need to go run and that I need to give my body a rest but then the little voice inside says, "Yes, but remember the scale this a.m.???"  Ugh!
But alas, I will not give up.  I will continue on with the diet.  You want to know why?  Because I feel better and that is what is important - not the numbers on the scale.  Regardless of what the scale says, I have noticed a difference in my body.  The diet is also a cleansing diet and I feel healthier.  My stomach is flatter (yes, you can tell that in just 3 full days), I didn't "gain" 3 pounds over the weekend like I would normally do (I say "gain" because its usually not a true gain in that short of a period, its usually water), I know someone else is being tortured right along with me (thanks Mom!), and I will NOT let food win!  I have a goal and I will reach it!  Scale be damned!  Who invented the personal scale anyway????  I would like to kick him . . . . . really, really hard.

So next week is recovery week and I am really excited for that!  I will still do my cross fit class with my buddies on Monday and the crazy YCross class with the same group on Thursday but the rest of the week will be Yoga and Recovery.  Yay!  Then on to Phase III of X2.  My husband is already in Phase III and every workout comes up stairs all sweaty and out of breath.  Hmmmmm . . I am a little nervous for Phase III but I love to change it up after awhile so should be fun!