Relationships

I’ve feeling so defeated and hopeless in this area. Just about every woman I know deals with infidelity with their partner. I am. Been with my SO for almost 5years. Ive dealt with it that long and I know its my fault I stayed.. but its hard for me to leave.. I’m so hurt right and self esteem low. I’m a nurse and I honestly don’t need him to make it in life. I think it’s because we have an almost 2year old now. He’s a good dad but a very terrible partner.. i kind of feel stuck. My family lives far and I have a few friends and they know about how he has treated me in the past but i stopped talking to them about the things i go through for a while now because I started feeling like it was pointless telling them when i continued to be with him. How do I get out of this situation? Its my first serious relationship and idk what to do… its easy to tell someone to just leave but i need to detach my feelings from him or else I think i’ll keep letting him back…I’m so tired of hurting and being stressed…