Communication is key. You need to discuss this with him. Counseling would help.

Is he doing drugs or drinking? Is that why he doesn’t come home?

I wouldn’t throw in the towel before trying to work this out.

If you stop having sex with him, something’s gonna give. That’s what I’d do, if I were in your situation. Stop the sex and communicate. No sex until you get to the bottom of what’s going on and repair the relationship or else it’s over.

Some may say that’s using sex as a weapon. But, if all you have is sex, why should he be using you?