My girlfriend

Few times in life can a person truly feel in Love.  What is Love?  is it the first time you feel like you trust a person completely?  No.  Just because you think you can trust someone completely does not mean that you can.  In fact, it is exactly then that you must be most weary. 

 Even the most secret of secrets my girlfirend and I both discuss.  This unfortunetely also means that we have to struggle to understand what we are thinking and feeling.  If we don't, we can't express it, and if we can't express it, then we have to figure out how.  As we grow, we have different experiences, and oppinions that we learn as we grow.  This sometimes can be challenging.  The question I never have to think about is of course, is it worth it?  Yes.

So how do you know what Love really is?

You can always do the 'front porch' test, and see how they fit in with you and your friends. 
You can try to see if you like them enough that if they could never had sex with you again, you would be able to survive.
Ask yourself if they fit in your 'plan'
Ask yourself if you can see youself growing old together. 

The above listed are easy to get into a relationship and have these happen.  The test I have always found most important is; if they cheated on you; how would you respond. 

My greatest fear is the silent treatment.  Communication is required for something as damaging as infidelity. 
Have I ever cheated, no.  If my Girlfriend did; I would rather have her tell me afterwards then to have her lie.  Sex is sex, it is who you want to be with for the rest of your life that matters.  Truth is one of the only things that can help any relationship last.

But I haven't answered what Love is. 

Love is what I experienced a month ago.  I realized that I can tell her anything, and she doesn't judge me.  She asks me why, and then she listens.  She corrects me when I am wrong.  She gets me focused when I talk about myself too much.  She keeps me in check.  She deals with me when I am distant, and even more then I am Clingy.  She understands when I have energy, and can even tell when I am working to show having energy when I really have none.  She can tell when I am lying, which is something very few people can do .  She sometimes does the most annoying things possible, and I Love her for it. 

When you can't think of a single thing that you don't like, that is Love.