Really being in love means... every time I see an attractive woman, instead of thinking damn I feel a lack, I'm missing out because that honey isn't in my life... rather, I feel already fulfilled because my lover is there for me.
I have only felt this level of fulfillment twice in my whole life. When it happens, that's how I know it's true love. When every other attractive woman only brings my thoughts immediately back to my beloved and how fulfilled and grateful I feel because of her. There is room for only her in my heart, she's all I need, she's all I want.