How Do I leave

I’m on a joint lease with SO that doesn’t end until August, I am ready to leave our relationship keeps suffering I have done so many chances that it’s gotten to the point where he may love me more than I do him, every apology I’ve accepted, every chance I have given makes me realize that I’m just enabling him and it’s not a behavior I want my son to grow up around. It took constant fight in me to accept that trying to keep my child involved with their father because I had a two parent home that I need to stop it and grow out of that mentality. I don’t want him treat his future wife this way, I don’t want him to think it’s okay because mommy went through it (nothing domestic). I have a car and I work from home, i Uber as a supplement and I don’t mind. I have a 10 month old and family but I’m not ready to run back to them, throughout our relationship we moved back in with family but it doesn’t really help. I know I can leave my son there during the time I work but that’s from 2pm - 11pm like I said it an @ home job, I just need guidance on how to initiate it.