I'm not good at giving ultimatums

I thought about giving him an ultimatum last night, but I couldn't. So this is our conversation and what transpired. 

(Because I'm a pushy bitch, and I knew that he was lying because he TOLD me earlier he wanted me back I kept pushing)

So, now I'm stuck here again, being strung along some more. Not knowing if we are or are not going to get back together. I want him back desperately. I wish he'd stop letting her unknowingly make decisions for him. Why can't I just have him back?