when you love someone, you never want to be without them and you always wanna make them happy.
but when you're in love with someone, you have so much passion for them. when you're with them you feel like you're just MEANT to be together. you never want to let them go. you want to do everything in your power to make them feel the way they make you feel... and so much more. it's really hard to understand until you've really been in love.
Easiest way to explain is you love your parents and you are in love with your better half.. Or your have dated someone and you love that person and you will do almost anything for that person then you could say that you love that person but dating someone that you would do anything for like and you can't go about your day without telling them you love them or looking at the them then your in love. Hope that helps