Here's the key:
"Love" is a verb. It is an action word. It is what you DO for someone else. Everything-- being kind, listening to them, comforting them, making meals for them, scrubbing their floors and doing their laundry, providing for them, giving them children, raising their children, tending to their physical and emotional needs, being a trustworthy partner, etc.
Being "in love" is J. that. A state of being. An emotion. It is all those emotions you listed rolled up into a big ball that you can only see part of it at a time. First you see the lust or smitten OR you love someone as a friend and then later develop the lusty feelings where you get the butterflies and your skin tingles at the thought of them. The deep emotions that accompany long lasting trusting healthy relationships comes later. And usually takes lots of time and the sharing of major life events (marriage, buying home, birth of children, enduring the loss of family members or other loved ones together, etc).
Ideally, we would all be loving and in love with our spouses every day. But both tend to wax and wane. We're all human.