Sorry to hear things aren't turning out so well. If I have led you on in any way with my hopeful posts, I apologize for that as well. Love is always a risk. There are times when monogamous relationships don't work out, and there are times when polyamorous relationships don't work out as well. The important thing, I suppose, is to be willing to give love another chance sometime in the future, even if you get hurt and burned this time around.
It sounds like the ex girlfriend is really hogging the attention and freaking out a lot. Maybe she'll improve in the future, but you'll have to decide for your own part how long you can endure this kind of flooding.
Let us know if there's any way we can help.
Love means never having to say, "Put down that meat cleaver!"