How do you no when you are in love or if you love somebody how can you tell?
You can't picture your life without them.
You constantly think about them.
You put them before yourself.
You are completly unselfish with the relationship.
You can comprimise and accept all of their flaws.
You love them even when their not perfect.
You can see yourself marrying them and having kids with them.
You can see yourself growing old with them.
In a cheesy way they complete you.
They make you a better person.
They accept all of your flaws and love you because of them.
You fight, but you learn from the experience and grow as a couple.
To quote Doctor Suess:
You know you're truly in love with a woman when you can sleep at night since reality is far better than any dream.
You just know deep inside, without a doubt.