Definition of happiness

I was wondering my entire life what happines is like. What does it mean to be happy all the time? I wondered if it's even possible to be happy always. I've been even misbelieving that happines actually exists.
And yes, this is one of those stories which starts with "one day". You were my "one day". Since the day I've met you, my life has changed completely. I fell in love with you. I became happy. You became my happiness. I was happy 24h a day, and I'm still happy, even more. I was misbelieving again, but this time I couldn't believe that all happines is in one person. In those eyes.  Then I realized, happiness is equal to love, and love is equal to YOU.