How do I get out of a toxic relationship?

I am aware that our relationship is toxic. I feel like it is not working out but I always find myself not breaking it off and continuing to “work things out”. He is inconsiderate, not romantic, irresponsible, and hypocritical. We argue multiple times a week- mostly me expressing my feelings about something he did then him defending himself. Most of the things he does are because of his “I do things on my own corner of the world” attitude. Basically he considers himself unbothered and worry free. In reality he is just inconsiderate to those around him and irresponsible to anything he has to do. I call him out in hopes of change. He argues at first but then seems to be understanding and willing to work on himself. I forgive him for whatever we argued about and we continue. Then he does something else that upsets me. He upsets me a lot. I say I love him but I don’t even know what that feels like anymore. I got it so confused. I haven’t been in a relationship in two years until I met him. It’s been over a year now. It’s been hard. I’m not happy with him but at the same time I don’t want to let him go. I think I’m scared to be alone but he makes me miserable. I lose sleep because of him. I become irresponsible and neglect others for him. I do not like who I am with him. But I can’t leave him alone. I don’t know how to make it any easier.