Very few people in high-school relationships actually love eachother..I know when I asked people who have had girlfriends/boyfriends if they'd ever been in love, they say "no"....well, some of them say they are in love when they are in the relationship but once it ends they're like I've never been in love lol so yeah...love is not like friendship, in the sense that you can have many friends but not many people you are like, head over heels in love with.
But agree, people who say they love me after one date or whatever....I'm like "wtf? shut-up.." because they're obviously insincere or just really, really emotionally troubled...