He's making me lose my mind. why can't I break away from him?

My ex-boyfriend and I are still talking and having sex. He's seeing another woman, and I'm talking to other guys as well. But the thing is, I'm not sleeping with any of them. The only person I'm sleeping with is my ex-boyfriend. He keeps telling me he wants to be with me, then after we have sex, he disappears. He's been doing this since 2019. When I used to run out of things, he told me to ask other men. He was only giving me $20-$80 here and there. I'm the one who is still cooking for him and giving him thousands of dollars. I was always the sole provider in our relationship. When I had my car, I let him use it every day. Sadly, he was picking his baby's mother up in my car and slept with her in it. So one day, I messaged her. I told her to stay away from him and to stop calling. She said, 'He didn't tell me that he was with you. I didn't know you existed.' SMH, he was hiding our relationship from her. He didn't know anything about her. It was just a bunch of mess. I was mad at her to the point that I ended up watching her in public with my friends and family. Oh well. I was making sure she wasn't going to his house. Even though last year, sadly, I saw them two together walking to his house. Lol, none of them have a car. Smh. I don't know. It seems like I'm losing my mind over him because I want him to act right. But I keep finding out he's having sex with other women, and he's definitely not using protection. My hair fell out, and I'm excessively drinking every day because he's stressing me out. Why can't I break away from him?

He's making me lose my mind. why can't I break away from him?
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