We are not a couple but we share children. We jointly decided to make this move for economic reasons. The cost of living and "living wage" are not close to level in my home state so it's always a struggle. 

Moving would benefit all parties, most importantly, the quality of life of the children would increase when funds are not so tight. 

The problem is. He has already proven that when he doesn't get his way or his feelings get hurt, he leaves. Thus the relationship ended in divorce. When this move happens, I'll be starting over AGAIN and will not be in a place to fully support the children and myself for at least a month and will have to rely on his support.

He thinks I'm being dramatic because we are arguing now and it's giving me flash backs of the time he moved out when I was visiting family states away and left our children with a babysitter and I've now expressed my concerns for the joint move. 

I don't think I'm being TA here. I've been hesitant to do this for 3 years and I've finally agreed but I also need to think through all the possible scenarios just in case we do this and he leaves prior to me being established enough to support the children and their needs. 