I think it's probably normal to question things in a relationship. But it does sound like you are happy (and in love). I think maybe don't look at love as a certain feeling. If you're measuring it by some kind of magical euphoria feeling, or how the movies and some books portray it, you're never going to find it. I also think maybe each couple is different. You seem happy, so I'd say go with that. If you care about your SO, and want to be with him, that's all that matters.