According to Mohammed, Anthropology Professor extraordinaire:
When we say I romantically love you, we mean a host of things including, but not limited to, I care about you, I will be loyal to you, I will protect you, I like who you are, I can rely on you and you can rely on me, I admire you, you inspire me, you make me feel good...etc.

But we also mean, I like being physically intimate with you. I like kissing you and having sex with only you. Physical intimacy is a defining factor because in its absence, we could be describing how we feel about our best friends. When physical intimacy is a factor, jealousy is a factor. We are jealous because, according to Freud, humans lapse into mental psychosis. Romantic love makes rational human beings irrational.

All of us twitterpated, romantic fools are on the pathway to mental psychosis where a good majority of us have already gone. Mohammed and Freud aren't saying anything new here. We already knew that love drives us crazy. But I think that being sane and out of love is much worse.
Crazy? I was crazy once...