Would you stay in a relationship like this?

Been together 7.5 yrs. No engagement or marriage. I wanted to for a long time to get married and he always promised we would, when we were done with school, had jobs, had money saved etc etc. Always something new excuse. Now i don't want to get married. We have a 4 yr old son. We are 25&24 yrs old, been together since I was 16 and he 17. I keep waiting for him to grow up, have goals etc. But he never does. He used to work at McDonalds for 2 years, then he is now in sales. He doesn't want to go to school or have a real career. I have a good job. We could both support ourselves separately. Our son would stay with me bc he works from 9 am to 7 pm. I work from 7 am to 2 pm. I can provide childcare for him and he can't.

He left us when our son was just 4 months old for 6 months and he visited like 4 times total during that half a year.

A year ago i wanted to break up but he refused to leave and i ended up cheqting on him with a coworker. He found out. I packed his stuff. He still didn't want to leave. I felt bad so i agreed to try to work things out again.

I cannot touch his phone. He has fingerprint lock on his phone and he sleeps with it all the time. I cannot look into his phone but he has all of my passwords. We rarely have sex anymore, maybe like twice in 3 or 4 months.

But he is good with out son. He takes him to kimdergarten 4 days a week (even though i could take him too) and then he goes to work and comes home at 8 pm and play with our son for an hour. Then he goes to sleep.

That is his only good quality.

Some other things: he constantly slams the doors when he is angry and doesn't care that it triggers my ptsd from childhood abuse. He theratens our son with physical violence when he is angry. He belittles me. Says i am stupid for having mental illness. That i am just imagining things (he doesn't believe mental illness exists).

He doesnt support my goals or dreams. Says i should be happy with what i have. He can't save money at all.

I want what's best for my son. He loves him so much. And he said he would never visit him if i were to break up with him. What do i do??