So Confused!

Ok, so weeks ago his attitude and the way he would be calm one minute and crazy the next made me realize that he was just plain crazy and I needed to get away. However, these last few weeks it seems as though he may have changed. He has been really calm so far. Not get mad much and not so jealous, however, will it last? I on the other hand have been snappy and short tempered towards him. But he has calmed down so much that I somehow reluctantly agreed that if he can get my older daughter in a preforming art school I would go back on the 14th. But know he is saying it would have to be on the 2nd which is a holiday and for last minute tickets is 3x more! I don't know about this. My oldest wants to stay here but my younger one wants her dad. I would like to give him another chance but here at home and what if he goes back to the way he was? Then it was all a waste. I feel so sad, confused, and anger. I see all these happy families and loving dads and it makes me cry. I have two beautiful girls that I love but with two failed relationships. And no money, car, home or anything. If he did change then is it wrong to go back just because he can provide me all of that plus maybe a happy home? Can I learn to love him again? Or should I stay and be a single mother - again? I know I can do it but as I much as I don't want to is it really worth the risk of going back? I wish someone could give me an insight. I feel so lost and confused.
If I ever needed a sign this would be the time.