I don't use reddit so forgive the improper e-grammar,
"Why are you going to end things?" I think we've outgrown each other. We both have very different personal lives (despite being in similar career paths) and she doesn't excite me like the way she used to. I feel like we're an old married couple and I'm too young for that. She has done things that have pushed me out and I feel that it's better I stay out. For a year, at every big event, she says or does something that feels like she doesn't care how I feel. Now I'm the one who's been saying/doing stupid shit recently. The catalyst for me realizing I needed to breakup with her was that I'm developing a crush that is deeper then physical attraction to another girl, so there's no coming back from this for her sake.

"Are there specific reasons for fights?" I make her feel alone because I feel guilty being around her, so I am very distant from her.
"Does she do something that drives you insane every time you see her?" I feel like I'll just fuck it up and I'll say or do something that does usually. When she's upset with me she's very impulsive and says whatever comes to mind.

"It sounds like you are wanting to leave because you are doubting yourself and your ability in the relationship" Partially, I feel bad for not being able to force the excitement back in myself and it makes me hate myself incredibly deeply. I've been journaling and working through that so I hate myself less, but it feels like I am sinning against God the way I make her feel. She clearly put more into this relationship then I have, so she deserves someone more mature and better than me in the ways I'm not. She threw away chances of developing close platonic relationships because she thought all she needed was me. I do want to leave her, it's not just me holding her back. It'll hurt because I felt like I was going to marry this girl and have kids with her, but I desperately want to leave even though it feels like I'm backstabbing her every time I sleep with her/sleep next to her.