Give your reasons, say it's not her fault. But you just met somebody new.
Tell her not to get obsessed, second-guessing everything you said and done
And then when she get's upset, you tell her how you never meant to hurt someone
And you tell her that the only way her heart will mend, is when she learns to love again
And it won't make sense right now but you're still her friend, and then you let her down easy..