When you want to be around someone all the time. Even if no sex is imminent.

I cannot say for sure but I simply feel it. It's like my eyes do not get off him. I think about him all the time. And it has more to do with the emotions.

You feel it inside

Being in love is, when you can't get him out of your mind then when he break your heart into pieces yet you still coming back for more even if he will never offer you sex but you care enough for his happiness... it's the sweetest thing ever.. and believe that someone out there is waiting for you. Your own criteria.. i know it's really scare to let him go, but to love someone so deeply is to set him free and trust his heart, and his love will never die the way you love him

You think about them all the time.

Thinking about them makes you smile and makes you happier than 99% of all the other things going on in your life.

You stalk them (online of course)

You want them to be happy more than you want yourself to be happy.

You feel no bad feelings towards them. Even if they are rude/mean to you, you feel greatly saddened and start blaming yourself, but you would NEVER blame them or get irritated with them even if it is their fault.

You come up with any excuse to see them or even just look at then for a few seconds, just to get through your day.

They are the most attractive person in human history as far as you're concerned. They have no flaws, looks or personality wise.

Just one word, one look, one smile from them can turn around your entire day even though it was the worst day ever until they came along

You compare everyone to then, and everybody else comes up inferior.

And if its true love, you will feel this way for the rest of your life, no matter how long its been or how far away they are from you.