The Last Kiss

Just got done watching 'The Last Kiss', yes, the OTHER movie with Zach Braff. Brielfy, it is about a guy named Michael who, has a perfect girlfriend, good job, the whole 9 yards, and they realize that Jenna, his girlfriend is pregnant. Michael has commitment issues as it is, and the pregnancy, as well as a close friend's marriage, send him into a state of "crisis", as the film says. At the wedding, Michael meets a cute little brunette who is ten years his junior, and who is also shamelessly hitting on him, all the while knowing full well that he has a girlfriend. At first he blows it off, until he has a fight with Jenna. One thing leads to another, a couple lies are told, he is found out, and 7 kisses later, Michael is kicked out of the house, and finds himself in the 19 year-old's dormroom. when Jenna refuses to take him back, after finding out that it was in fact MORE than just 7 kisses, Michael spends 3 days and nights on the porch, and realizing that all he wants is to be with her, he will "do whatever it takes" to get her back; including sitting on the porch, in the rain, no food or water for three days, until she finally opens the door and the credits roll.
Throughout most of the movie, after the first five minutes anyway, I found myself wanting to kick at least one of the characters in the head at all times. Whether it be Michael, for not walking away in the first place, the little slut Kim, for being a home-wrecker, or one of the various supporting characters for being absolutely stupid, even Jenna in the very end. As much as I did want her to forgive him, because, lets face it, realistically NO man would wait out on the porch for three days in the rain after being beaten and run away from, I couldn't believe she actually opened the door to him. I don't know if that shows incredible grace, or incredible stupidity.
I think the thing that had me the most confused was that here Michael had this perfect girl who loved him, yet he still found it necessary to go out and explore other options, which poses the question, are we ever truly able to appreciate what we have until we don't, or can't have it anymore? Is the grass always greener, or does it just appear to be so? And, does it take exploring other options before we can truly be happy with what we have? One might say that there's no doubt that Michael loved Jenna, but, as was pointed out in the film, it doesn't matter what you feel; what you feel only matters to you. It's how you treat the people you love that really matters. So no matter how he "changed" in the end, the fact still remains that he made the choice to go and explore other options. I thought it was very honest in how it showed the inability of people to control themselves, and the inclination to make poor choices, and the almost inevitable curse we have to hurt the ones we love the most. The thing that ruined it for me however is the dishonest depiction of Michael's remorse. I find it extremely hard to believe that if he loved her that much that he would sit out there in the rain with no food for three days, and was that devoted to her, he would not have cheated on her in the first place. He didn't have to go find Kim after the wedding. He didn't have to drive her home from school. I know that human beings all have the capacity to feel guilt and remorse, but the question still remains, what makes us do it in the first place? If we know we shouldn't, and we know it's wrong, why can we not stop ourselves?