<human>: Give me a shortened version of the text

I spent much of this year dating several women casually, and decided to commit to my girlfriend, let's call her A, about a month ago. Things have been good, but not great. I haven't felt a lot of chemistry with her and we don't seem to have much of an emotional connection. I realize I may have committed to her too quickly, and that's all on me.

Before I committed to A, I had been dating another girl (29F), let's call her B. I had strong feelings for B, but she had not expressed interest in a relationship, and we went our separate ways when I decided to commit to A. However, B and I met for coffee a week ago, and she said wants to be in a relationship with me. We had a very long talk about things, and after thinking it over, I decided that I want to end things with A and pursue things with B.

I am seeing A tomorrow to end things, and I am wondering what is the best way to go about it? I want to be honest with her, but I also don't want to hurt her. Should I be honest and tell her there's someone else, or should I make up another reason for breaking up with her?
<bot>: I need to end a month-long committed relationship because I met someone else. How honest should I be about the other person (if at all) when I end things with her?