Talk about a fucked up choice

So...the background:

I had made a deal with my mother, whom I rarely visit, that if during her endeavour to lose weight, if she reached 250#, I'd come visit. So, this past week, she did it. I arranged to visit for the weekend. She, her roomate, and I all went out Fri and Sat.

I was supposed to meet "M", a good friend of mine Saturday night. Unfortunately, she got a headache and had to cancel. Even though I was pretty bummed, I knew I'd get to hang out with her on Sun because we'd planned to go see Rambo together.

Well, Sun comes around and my buddy "J" invites me to the Ville to go work out. I head down that way, figuring I have plenty of time to head back to catch the movie. While there, he invites me out for the night. Now's where the fucked up choice comes. I made the decision to stay in the Ville and hang out with him instead of keeping my original plans.

The short of that night was that we did pretty much nothing, just wen to the Pub at 4th street, but I'd forgotten my ID, so we couldn't do anything else.

I spent the rest of the evening and all of today regretting it and wishing I'd kept my original plans. When I told "J" that I'd cancelled my plans with "M" he said I should've kept them too. So overall, I feel like a total dick and wish I knew how to fix it.