You're not the bad guy, I'm just the stubborn one

You asked me if he was worth it, if this was worth it. I said, the thing is, the happiness that I feel when I’m with him is unlike any happiness I have ever experienced. But the sadness that consumes me during the long periods when the happiness is gone is unlike any sadness I’ve ever had too. It is bottomless and makes me feel hopeless and sad. And I can’t decide which one is more affecting. Can I live without the happiness?
Can I live with that sadness?