Your first talk till dawn. The first kiss. When he introduces you as "my girlfriend". The first morning after. Finding the nerve to say "I love you". The first time you write "we" in an e-mail to your friends. The first time you fight and make up. That first trip together. How you are in love with your first love is a truly defining moment. Feelings overwhelm you. The rush of passion and excitement. From your first disagreement to the "I love you" confession, author Natasha Burton shares 10 key defining moments in every relationship.