Sounds like a nice segue into two songs The Beatles wrote (or might have put together).
Treasure those three words, my young friend, and appreciate the courage it must have taken to say them to you.
Whatever happens, and however you think they were presented to you, they meant something to the person who spoke them.
Love is a rare gift, you are lucky to have someone in your life that feels that way for you. My advice is to go slow, take your time, and see if you can love her back. Tell her so. Tell her you want to take your time with her, that maybe there could be something very good between both of you if she lets you nuture it. Have patience, it sounds like it could be the start of something very good.