Kait has it right. I couldn't say it better. This isn't going to be "happy families" for STBX. This: "Put your energies into getting the best possible deal for yourself."
It doesn't take much imagination to know how you must feel right now. I've even wondered if STBX was being obtuse or trying to wind you up for some reason? As they say, is it malice or just incompetence?
Probably the latter. There's a whole lot of "just not thinking" going on with him, I imagine.
However, therapy can help you identify your own patterns of thinking and reacting, or scripts. Which things push your buttons? How do you react?
Do you react in the way you like or do you want to change how you react?
"Scripts" are like programs of thought we form starting early in life when encountering stressors. Therapy can shed daylight on these patterns of thought. It can offer new patterns of thought you can apply.
And that leads to you being in control of your reactions, which feels great.
None of this will take away the pain of feeling "dissed" as the kids say. But it does help you to process the hurt and move on to a more positive place.
Less pain, more gain. It's worth it, believe me.