The only outlet I have

Sometimes, things come up in one's life that they need to talk about. Sometimes it helps to talk to a third party, like a counselor or a friend, and sometimes it helps to not talk to anyone but the voice inside your own head. Most times, though, it helps the most to talk to the person that is the culprit or the focus of the problem bugging you or affecting your life or otherwise existing in such a way to throw you off the calm, peaceful existence that you'd like to call your life. And since I know the person in question won't read this, and the few (if they exist) that would read it won't say anything/can't say anything/etc. makes this a better medium for venting my frustration.

Suffice it to say, I don't think it's a normal thing to think on a weekly, sometimes daily, basis after 7 years of a relationship that you don't want to remain in the relationship anymore. Even less so that, and I put my future at risk by saying so, depressing thoughts enter my mind mixed in with the angry and confused and fed up ones. Nothing serious, but they're there and have been for quite some time. Now, you'd ask yourself, why can't I just talk to her? The answer lies in what I know would happen and what I know I'd fail to say. I've no idea how to open up the conversation. "Hey, babe, I'd like to talk about us." is probably not the best way to open up the conversation. It would, undoubtedly, be misconstrued as "I want to break up with you". Which ... I don't want to. 7 years (technically 6.5) is a long time for a relationship. Fixing it is the best course of action, but I don't know how. I feel that, regardless of how the conversation starts, it will rapidly degenerate into an argument (where I am the one at fault), or crying. The crying would make me feel terrible, as if I was making a mistake, the conversation would go nowhere, and I'd be right back where I was.

Halfway through that sentence I lost my train of thought and lost what it was that I was talking about, so I guess I'll leave it here.