@acts2031 While many men are assholes, not all are/you never know what the future holds.
However the thing is you don't need a man to have a happy, fulfilled life.
So while it's important to raise your kids as best you can, you should also spend some time reconnecting with yourself.
Finding that person who you were before the toxic ex, and your children arrived into your life.
If you can't go out and do things, I'd highly recommend creating or joining online groups on discord or other soical medica apps which meet online for an hour to two each week. They are often built around hobbies and the like and it's good to spend time around others doing something you enjoy(as a means to build up yourself in contexts outside of being a mom or romantic partner).
So if you like movies, writing, painting, crafting whatever go forth and interact with those like minded types.
Then also (even if only for a half hour each day) squeeze in time to do things you want for yourself. So go read, or learn math or an instrument or history or cooking or anything you've ever wanted to try, a little bit each day.
Also work into your time with your kids little things like going for walks at a park, or yoga with your kids, or some other random physical activity. As just moving a out for 15 or 20 minutes a few times a week can do wonders for your mood and overall sense of wellness.
Do the above will help you find yourself again, which is important Since one day your kids will move out and on with their lives, so you need to build yourself and not define your existence only by what you can give others.
I know it isn't easy op, but if you put in the work it will eventually lead you to what you're currently missing.
Will save you from becoming that person you're afraid you'll become.