First rant, here we go.

This is going to be my first actual post, not so much of a rant per se...but it's something that's definitely been bugging me.

I've just about had it with girls taking words/actions the wrong way.
It doesn't help the fact that I'm already horrible with speaking, and I always have the tendency to say things I don't mean. My method is to say something, and explain why I don't feel that way.

Let's put it in a diagram:  Part A is the offense part. Part B is where I explain why that's NOT what I think.

Conversation:
Me: -Part A-
Girl: *interrupting* -gets offended and shuts out reason and logic at this point-
Me: -...Part B...-
Girl: -assumes I'm "just saying that" because I noticed how bad it hurt her feelings-

This is my problem: This girl has known me for nearly four years. She knows how I work, and she knows I have this issue with words. Yet lately she's been taking offense to everything I say and I'm constantly feeling the need to apologize.

I'm walking on eggshells with her.
Any ideas?