When guys say everything is "ok" are they really ok?

I feel like me and my boyfriend have hit a lull in our relationship. We've had some fights lately but he hasn't stopped wanting to see me or call me. He still tells me he loves me, uses pet names like princess and cutie, and holds me when lounging around. I ask if everything is ok and he says yes and I know I have been getting on his nerves asking that but I just feel as though something isn't right. Do guys put that much effort into a relationship if things really aren't ok?