I thought my first love was a guy I was with on and off from about 18-20. At the time I was convinced it was love but he was just a massive jerk. He was super controlling and just bad news. I was heartbroken when it ended.
I then met my now DH and realised this is what love it. He's the most amazing guy in the world and it literally was love at first sight. Lots of people used to say to me "you'll know when it's love" and they were right!