What is love? Love is a simple word, we make the chemical reaction. Love itself isn't anything too shabby, in fact it's a conjuction of letters. A combination of a broken down and rearranged alphabet; what the chemical reaction is is that weird feeling you get when you're around them.
When you see them go, even though you know you'll see them later, does it sting, hurt, ache, burn? That is the weird void, for love is a void of two weirnessess that've come together. When you find someone whos weirdness is compatible with yours, keep the around BUT, if they try to leave then let them. 'Tis when they come back that thou shall remain together. Like two magnets, opposite sides having come together, love is only a word that a chemical places the force behind.

TD;DR Version 1.1: Love is a word, the implicatoin it gives off is the true importance.

Like, Lust, Pride, Loyalty, Loneliness, Confidence, Infatuation, Friendship, Lies, Charity, Pity. All of these are present during a relationship, in one form or another; not all but some. Love is what brings them together to hold no absolute value, for the person you love fills that gap in your heart, your loneliness is tossed aside. For pride is that feeling you get when your love is confused and you're at a loss for words, like a like. Charity is what you feel naturally, to show the person you love that you truly DO love them by giving away what would've been a prized possesion, simply to get 5 more minutes with them. Pity is what others feel towards you when you're 'stuck' in a wedding and forced to live with one person forever, little do they know that you're currently the happiest person alive, and possibly dead. Lust is what starts it all, an urging feeling to be around this person, as time passes you might find more then a need but a want; you get past your sexual drive an

TD;DR Version 1.2: Everything you said ties into each other, but only true love prevails in bringing together the differences into a profitable relationship; ergo true happiness.