How to decide between 2 girls?

Hi All, Ok I am in a bit of an emotional (for me) situation. I tried online dating and I've "met" two girls (not yet in person, will explain that). Obviously I feel a little crap because one girl will likely get disappointed as I'd have to say something (unless they make it easy for me). I can be callous, heartless etc but not enough to date both at the same time and neither girl deserves that. GIRL A: We met online back in 2011. All was fine until she deemed me too tall for her, and things kinda just fizzled out. She even said I am too tall to be her boyfriend, so there was little incentive in continuing, so I didn't. Back in April 2012, she came back, we talked about why we went quiet, and we got closer. We agreed to meet and tried several times but a number of factors not in my control (or alledgedly hers) meant it's never happened (or she is BS'ing). She always said she was too shy and then when I randomly asked her one day she said she was ready and come and meet in a few days and also once later with very short notice (and was holding it against me as I couldn't meet at such short notice). Nonetheless, she does appear to not be serious. Eg she said she wasn't on facebook, I found her on there, then she says she is, but won't reveal her details when are "friends". On top of that, she seems very comfortable with another guy (she has a pic of her and him, he has a pic or him and her) etc. GIRL B: We also came across each other over online dating. This girl is hot (but GIRL A is still cute) she is straightforward (already wants to meet after just a few emails), confident, etc (even talks graphically over email). She is quite open and honest. Obviously I can't say much more as I am still getting to know her and vice-versa. But with GIRL A I feel like if I told her it's off I'd break her heart and my own. I also feel a very strong bond to her but this may just be due to the amount of time we have spoken. I wish I did not use such sites after GIRL A was up for meeting but I just could not take her seriously due to all the meeting failures. :( One way to decide is to see who wants kids, as I don't. I think GIRL A said on her profile she did not, but things change, and I always wonder when you can ask this (Even my friend at work who doesn't want kids was wondering this). Any thoughts, solutions, much appreciated! Thanks

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