How did you know when to give up…?

I just feel like it might be time to give up on my relationship. 8 years together and I’m pregnant with our third child. Things are still the same. We are never a priority. Today is Father’s Day and he would rather spend the day out with his friends than with us. He spends all of his free time with his friends and not with us. I have had multiple talks with him and he says he will try and nothing ever changes. He just doesn’t care to. It terrifies me to be a single mom but at the same time I just can’t take being alone all the time while in a relationship. It’s not fair.