New girl: Keep up the no contact and get on with your life without Mr. Indecisive in your life. If he wanted you, then he would have told Old Girl to go **** herself, he would have blocked and deleted her so she couldn't harass him while he nutured his budding love for you. Google: Rebound Relationship and educate yourself about what you were involved in. If you take him back, new girl, I'd have a hard time understanding why because the chances are higher that he'll leave you again once he gets his mojo back from breaking up with old girl once again. Whatever you do New Girl, do not start hanging with him while he's still with her. If you let him have his cake and eat it too, he will never respect you enough to consider you past the casual.
Old Girl. You're a piece of work and I tell men to stay away from women like you all the time. Boarderline personality disorder presents in the way you treated your relationship with this 'boy." People who's actions say "Get away from me, now come here" make horrible partners with their emotional abuse.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion