My husband and I have an agreement that he is home for dinner every night because we have young children, and eating together is important. Right now, our kids are infants, and so I need him home a little more often than I used to. I suspect when the kids are a little older, we'll go back to the routine we had before the kids came along, which was that my husband had a guy's night out about once a week.
I do think it makes a difference whether or not your kids are also your boyfriend's kids, or whether you are long-term cohabiting with the intention of marriage, things like this. If the answer to both is no, then I'm not sure what influence you have to insist your boyfriend come home. You could tell him how important it is to you, but if he doesn't care, you'll have to decide if it is a deal breaker. However, if the answer to those questions is yes, you need to sit down and have a long talk with him about the importance of family time, of being together in the evenings after work so that the kids get to see him and continue to build bonds together, etc. Good luck.