I consider my marriage a happy one. We argue once in a while, but shoot, I argue with my friends and siblings on occasion too.
I can tell you this, I would rather fight with him, than live without him.
I know that when you are fighting,(not literal), it always feels like the end, and you feel like, why do I bother but once it's over, if it wasn't a deal breaker I mean, then you wonder, why did I let that affect me so bad. At least I do that. I admit that it's not perfect, but nothing is.
He is a jerk at times, but so am I. I certainly wouldn't want to date or find a new one. The grass is not always greener on the other side and you might find what you had was worth having once you lose it. Of course the opposite could be true also. I'm just happy enough not to want to try to find out.