Wow, that is me too. I try to keep a balance but it is so hard. Therefore, I try to keep it at a bare minimum throughout the week and weekends it depends on where I go but find I do pretty good. I find that as long as I am putting in the time to do at least 60 mins of exercise per day, which is what I aim for each week (maybe take off one or two days). Some weeks I make the 60 mins/day some weeks I don't but the main thing is to get the exercise in incorporating different exercises and then I don't feel so bad if I am cheating. I just try to cheat less. Sometimes I do good, sometimes I do bad.
Now the scale. I find that I am more depending on how my clothes are fitting. I was gauging my weight by the scale too but the scale is too unpredictable and doesn't tell the real story.
I got on the scale this moring after avoiding it for about a week and a half and discovered that I had lost about 2lbs but my clothes was telling me that something was different still I thought I had probably gained because I had only exercised two days last week because I have a problem with my knee and have to pay attention when it pains me therefore I rested it until Monday. So I was elated because the scale had moved!!!!
Exercise, exercise, exercise - watch what goes in the mouth - be encouraged - be patient it will change believe me. SP is a great resource.