how important is being in love?

This is very similar to another question you posted. I don't know why you didn't marry the two together and make them one longer question of more substance. However, I will answer this one as well, since you put them in separately. Being in love is the most important thing in life... not necessarily with a partner, but with life itself. Look around you... what do you feel. A love for life? A love for nature, the people around you? Yes? Then you're happy in life, and those who are not, will envy you for the love you have found.