You're not giving up on your M by moving out. You're letting it go for now, dropping the rope, finding yourself and making you and your DD a priority.
It is hard to know whether you'll be happier in the new setting but the new setting is not a life sentence. You adapt, you change, you change the setting if you want to. You are in control and with your cautious and good decision making personality you'll be just fine.
Well I don't think it's impulsive, you've been thinking about this for a while but it's the taking of your first step in that direction that's making you uneasy which is understandable but I bet you took greater 'risks' in life than finding an apt to move to and you survived- perhaps backpacking in the backcountry or bungee jumping etc?
I didn't see the: "you're right, we're not meant to be together" that's the beauty of that sentence from Robx/Gucci (i forget) it's open to interpretation but has a powerful message about you not becoming a doormat. But of course you have to see when and if you should use it.
I can understand all your thoughts and emotions about wanting to keep trying or give it one more try and I'll never tell you not to do it because ultimately we all have to live with our decisions. However, look at the history and decide if it'll make a difference and if he's even anyone you want to have for the rest of your life? You're still young! and about the concerns over your future R and marriage etc don't let one person define your whole life. And you know what NB? Who the heck cares if you can't find the right guy anyway? (hypothetical worse case scenario)? you're whole, you're complete, you don't need anyone else to be happy. Find yourself, enjoy yourself and treat yourself well.
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again