So, to clarify, are we talking new age love or real love? Because real love(in the relationship way) is kind of a one-time forever thing, but you sound like you are talking about the new age love where every time you date somebody you're 'in love'(insert: fluttering eyelashes). Also, new age love can be translated to: I liked them a whole lot. See, you can stop liking a person, but if you actually love them, then that never ends. As a side note, if they don't like you back, then it cannot flourish into love, and if you keep after them, it makes you a lustful stalker. Another point to make is that immature and younger people who lack the wisdom of age or experience do not know what love is. They claim to, but since when has a fool ever admitted what they don't know?
All I'm saying is, you don't know what love is, and you probably won't understand it for a long time. In this day and age, many people never learn what love is because they are too busy trying to call everything 'love.' You can't love every other person you date because you can't love someone you don't know. How can you say 'I love you' when you don't even know who they are?
Which brings me to my second point: You can (brotherly) love a stranger, but you cannot love them like a lover does. An analogy for this: Think of a video game that you were sure was going to be awesome. There was tons of hype and everyone in the media was praising its amazing whatever. Now, when it comes time to actually get or play the game one of three things will happen. 1)It's a fantastic game; 2)It's an alright game; or 3)It sucks. The way you feel about that game before you get to play it is similar to how you feel about people you don't know. Sure, it looks great and puts on a good show, but once you get past the surface, things can be completely different.
Going full circle here: The impossibility of loving a stranger is also why young people cannot really love(however, there have always been exceptions, but these people did not 'love' five others before they found their actual love). Before you really get to know someone, you always act differently around them. Maybe you are more polite in trying to impress them or you might show off more. Either way, you are putting on a show, not giving them your real self. As a young, inexperienced, and somewhat immature person, you do not even know who you are yourself, and it takes time to figure that out. Until you've found yourself, stop trying to find someone else, because you may only end up hurting them.
And since I've gone tangent-crazy here, to answer your question, yes, I am in love. It happened once. We got married, and our love increases every day that we learn about each other. It would not have happened though, if we had not dated for seven years before deciding to get married(and yes, we decided. Don't try to do that surprise crap, make sure they want to get married too. And then you can surprise them).