It doesn't make sense that he proposed and then didn't want to help you plan! You definitely deserve more and I'm happy for you that you stood up for yourself and knew you deserved more!
I know a guy who proposed...and then his FI refused to plan any type of event!
He wound up making all of the plans for the wedding, not his FI.
"He would not help me plan" is only part of it. I am getting the idea that this guy wasn't good for anything much; he expected the OP to pull the load and pull the cart as far as everything is concerned --- if she was stuck doing everything now, what do you think he OP would have been in for, once this was a legal and binding contract?
This isn't much of a character show on his part.
I am pretty sure she'd have wound up footing all of the household expenses, too -- and don't get me started on that. A guy who more or less lives off his wife and partner is no man at all.
She's well rid of this guy.
What I suggest for the OP:
Therapy! learn how to stand on your own 2 feet and stick up for yourself and put yourself first. And accept nothing less.
Maybe this is how you were brought up; you can't help that but you can sure help yourself right now.
Keep busy: don't stay at home and brood -- start with small steps; what do you like to do? Make a list of activities and find something to do that is related to what you like to do. Your best bet is to get involved with a group that is connected to your interest or hobby. Maybe try a volunteer endeavor that raises money for a good cause; there are many good causes out there.
I can name many things to do: learn a new sport (tennis, martial arts, kickbox) join a hobby related group, something volunteer at your house of worship (if you attend a church/synogogue/house of worship), alumni group of your college, night school classes, learn something new (photography, cooking, another language), join a civic/community group -- these are to name a few activities.
What about the doggie park? I'm a dog owner also -- there's always something going on there and there's lots of interesting people who bring their dogs.