Keep working yourself for you and not your H. Maybe he will notice in time, maybe he won't. Own your part in the failure of your MR but don't own his stuff. Look into getting an IC if you have not already done so. Realize this is not all your fault Since you are separated your contact with him should be minimal, business like, only about kids or finances. No talks about your R or D.....back way off. Let him go on his journey.
You are correct, you are responsible for your own happiness no one else is. Surround yourself with loved ones and those who can support you. Continue exercising, making smart food choices, drink lots of water, plenty of sleep. It is hard to be depressed when you exercise and increase your endorphins. Getting in shape will also help with your self-confidence. Men are visual creatures, predators by nature......if you take care of yourself physically he will notice, trust me.
Continue posting and journaling.....someone is always around.