<human>: Can you give me a shortened version of the text?

Sorry this is is terribly rambling, its not at all how usually convey my thoughts to other people, but I'm tired and confused and I just need some advice. 

Me (18/m) and my girlfriend (19/f) have been dating for about a year and a half now. It was in a word awesome until about half a year ago, when things started to get a little rocky.

The thing is i just don't know if i love her anymore, and I defiantly don't feel like I love her like I used to. I know that after a certain point that initial fire kinda settles down into a comfortable kind of thing, but we've only been going out for a year and a half, and that feeling of love has just completely vanished. It makes it worse when I know that she feels that I'm perfect for her and she's so in love with me ect ect. And whats worse worse is that i've started noticing other girls when i'm out and about and automatically comparing them to my girlfriend, and when there more attractive i feel much less satisfied with the relationship, which makes me feel like complete shit.

So a part of me feels like i don't love her any more, but then on the flip side my life is so much better with her in it, before her I was ridiculously  socially awkward, hardcore addicted to porn and video games, got mediocre grades and had a crap time in anything that looked like a relationship with the opposite gender. But after a year and a half I'm confident in who I am and in my appearance, I'm aceing uni and my habits and hobbies are mostly in balance and healthy and i feel like such a better man and person.

Not only that but when ever i seriously consider breaking up with her, I freak out and stop think about, because i can't imagine hurting her that much, nor can I imagine life without her.

So do I just wait this out as a rough period, trusting things can go back to how superbly awesome they were before or do the "fair" thing and tell her that I don't feel like I used to and let both of us move on.
<bot>: Don't know if i still love girlfriend of 1.5 years, on hand hand that feelings no longer there, but on the other I can't imagine life without her and she makes me such such such a better person.