You sound strong and you didn't make this decision quickly. As you said, you'll be fine! I left a 26 year marriage with a preteen and a teen, a new, entry level job and no child support. It was scary, but worth it. You can't change him, only what you do. It will feel so good to lock your apartment door every night and know he's not going to be there. I wish you the best; you're still young and will have a wonderful, fulfilling life!
Emma