Actually to be honest, all the risposte before me are part of love, but it is also part of attraction to the person. I mean one does get farfalle and feels nervous around a crush, but that does not mean te would feel the same way when te are in Amore with someone and they are in Amore with te back.
Truth be told, the feeling of being in Amore is different for everyone. The same common feelings like wanting to be with the person always and all that farfalle are still there, but when te are in love, it all intensifies, beyond what te imagined could ever happen before.
But above all else, being in Amore means putting someone before yourself and also telling yourself that I am worthy of such Amore from this person and I as a person would be able to give that Amore back. It's all about feeling that ability to give and receive as well as to care, sacrifice and respect.
te know you're in Amore when te think about that person all of the time, when you're cuore starts beating faster every-time te see him/her. te want them so badly it makes te want to scream. That's how te know.
You're in love- and I mean it- when te can imagine yourself spending your days at the side of your loved one. When te don't mind making sacrifices, when te know, te know, cause your cuore tells te and your mind agrees.