If your sponsor fired you, then that's on HER, not on you!!! We can't know what's going on in other people's lives...odds are she was having troubles in her own life and couldn't responsibly help you with yours at the same time. We all know how hard it is to reach out for help...what if she didn't want to burden you with her troubles, as that wasn't the role she was supposed to be having with you? Don't take that onto yourself as some kind of personal failling....odds are it had nothing at all to do with you.
Now...as for your new sponsor....don't place what happened from one person onto the next person...that's not really fair, right?
Give this sponsor the opportunity to understand what happened to you by being left from your old sponsor...give this new one the chance to HELP you..with all the facts!