<human>: I have been going out with my girlfriend for almost 2 and a half years.  Over time, she has grown up a lot and really changed her lifestyle in an effort to be a better person for me and herself; yet, I can't figure out why I don't want to be with her anymore.  Over the past few months I've tried breaking up with her multiple times, but every time I think about the amount of effort she's put in to our relationship and herself, I can't stick to my guns.  Recently, I've been talking to other girls online just so I could feel something again. And I feel ashamed, and I know I'm a horrible person, but I even made out with a few girls at a bar.  I'm a firm believer that your actions define who you are, and since what I've been doing is dishonest and shameful, then that's what I am; I'm not here to make excuses.  My only problem is that I've made it clear to her that I don't want to do this anymore, and I never wanted it to get to this, but as time goes on I just feel like I'm caring less and less, almost hoping she catches me doing something so it can just be over.  I feel hopeless and I don't know what to do.

Can you give me a shortened version of the text?
<bot>: how do I break up with my girlfriend when nothing is going wrong?  I just don't want to be in a relationship with her anymore.