I have been there Gmum! The first time H left, I had a D4, D3 and son not even 1 year old. I was a stay at home mom, with no job. He up and left and gave me no financial support. I promise, if you want to change the fact that you need him financially, you can. Some people stay dependent, because it is a way to keep them around, but he wont be around in the way you need. I am not in your shoes, so you do not need to change based on anything I say. Im just saying, if you are fearful about change, you CAN do it.
I would do whatever it takes NOT to initiate contact anymore. If he wants contact, he will find a way. If he does not want contact, it will not help your 3YO to force it. Just make her easy to be reached and let him do the reaching.
Me: 42 H: 45 M: 18 yrs T: 20 yrs D: 17 D: 15 S: 12 I kicked him out 8/21/15 I will DB until March 21st 2017, that is it!